CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

Given that ABCD is a square. To prove : AC=BD and AC and BD bisect each other at right angles. Proof: (i) In a ΔABC and ΔBAD, AB=AB ( common line) BC=AD ( opppsite sides of a square) ∠ABC=∠BAD ( = 90° ) ΔABC≅ΔBAD( By SAS property) AC=BD ( by CPCT). (ii) In a ΔOAD and ΔOCB, AD=CB ( opposite sides of a square) ∠OAD=∠OCB ( transversal AC ) ∠ODA=∠OBC ( transversal BD ) ΔOAD≅ΔOCB (ASA property) OA=OC ---------(i) Similarly OB=OD ----------(ii) From (i) and (ii) AC and BD bisect each other. Now in a ΔOBA and ΔODA, OB=OD ( from (ii) ) BA=DA OA=OA ( common line ) ΔAOB=ΔAOD----(iii) ( by CPCT ∠AOB+∠AOD=180° (linear pair) 2∠AOB=180° ∠AOB=∠AOD=90° ∴AC and BD bisect each other at right angles.

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Y=3x+5 has what by ch. 4

Posted by Divyanshu Verma 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Avyay Nampoothiry 4 years, 11 months ago

Has infinity many solutions

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How to practise in math for test Get marks out of out

Posted by Prem Jangra 4 years, 11 months ago

CBSE > Class 09 > Mathematics

3 answers

Mayank Mishra 4 years, 11 months ago

Try to understand everything and revise questions as much as you can

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Devika Lather 4 years, 11 months ago

Study daily, If you don't study daily,then read the base of chapter.after that solve questions and examples. Practice is the most important for maths?

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Ash Kumar 4 years, 11 months ago

Study daily

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Arrange in a.o= 7,8,96,9,0,743

Posted by Suraj Yadav 4 years, 11 months ago

CBSE > Class 09 > Mathematics

4 answers

Anmol Preet 4 years, 11 months ago

0,7,8,9,96,743

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Anshu Agrawal 4 years, 11 months ago

0,7,8,9,96,743 This is your answer

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Rahul Verma 4 years, 11 months ago

0,7,8,9,96,743

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Anurag Shekhar 4 years, 11 months ago

0,7,8,9,96,743

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ANSWER

X=9-4√5,find x2+1/x2 how to solve

Posted by Sindhu Shivanna 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Divy Dev Jaiswal 4 years, 11 months ago

1/X =1/9-4√5 =9+4√5 Now, (9-4√5)²+(9+4√5)² Solve it the answer will come

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ANSWER

in maths chapter 9 area of parallelogram and triangle was deleted

Posted by Sharad Srivastav 4 years, 11 months ago

CBSE > Class 09 > Mathematics

5 answers

Sunita Meena 4 years, 11 months ago

Yaah this Ch is deleted

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Vibha Pandey 4 years, 11 months ago

Yes.

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Bhanu Goyal 4 years, 11 months ago

Yup paper se phele pta lag gea kal paper h??

1Thank You

Kratika Sen 4 years, 11 months ago

Yup ! This chapter is deleted !

1Thank You

Rishabh Gupta 4 years, 11 months ago

Yes , this ch was deleted

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ANSWER

1×1÷4×2+6+6+7+8÷2÷ ×2×1÷1

Posted by Toshak Thakre 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Veera Babu R 4 years, 11 months ago

61 or 62

1Thank You

ANSWER

How to find ratio between two surface area of ballon

Posted by Pawan Chauhan 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Avyay Nampoothiry 4 years, 11 months ago

SA of a sphere =4pie r^2 Therefore,ratio of 2 surface area are 4pie R^2 / 4pie r^2

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What is congruency of the triangle?

Posted by Niharika Sumant (Jiya) 4 years, 11 months ago

CBSE > Class 09 > Mathematics

4 answers

Niharika Sumant (Jiya) 4 years, 10 months ago

It's not the answer of my questions Mr. Saurav Kumar

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Saurav Kumar? 4 years, 11 months ago

Side and Angle

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Varsha Varsha 4 years, 11 months ago

Which has same shape and size then we can conclude that it is congruent o:-)

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Saurav Kumar 4 years, 11 months ago

बुढे वन बाबा की खातिर रस उडेलकर गा लेती हैं पंति के माध्यम से केदारनाथ अग्रवाल जी कया कहना चाहते है

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Arrange in ascending order :- 7,2,3,9,844688,288

Posted by Suraj Yadav 4 years, 11 months ago

CBSE > Class 09 > Mathematics

5 answers

Bhanu Goyal 4 years, 11 months ago

2,3,7,9,288,844688

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Suraj Yadav 4 years, 11 months ago

Arrange in a.o = 5,3,2,2,4,0,68874433

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Suraj Yadav 4 years, 11 months ago

Arrange in a.o = 5,3,2,3,4,0,6,8

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Ranjeet Kumar Pandit?? 4 years, 11 months ago

2,3,7,9,288,844688

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Atul Verma 4 years, 11 months ago

2,3,7,9,288,8446888

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5x-4x square+3 at x=-1

Posted by Peerzada Mohammad Azhar 4 years, 11 months ago

CBSE > Class 09 > Mathematics

4 answers

Priyal Rathod 4 years, 11 months ago

-6

1Thank You

Ranjeet Kumar Pandit?? 4 years, 11 months ago

Answer will be -6

1Thank You

Rishabh Kothari 4 years, 11 months ago

Answer is 2

1Thank You

Rishabh Kothari 4 years, 11 months ago

Placing the value of x p(-1)= 5(-1) - 4(-1) +3 -5+4+3 2

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ANSWER

Simplify: (√5 + √2)2.

Posted by Hemantha M G 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Harpreet Singh 4 years, 11 months ago

(√5 + √2)²= (√5)²+2 (√5)(√2)+ (√2)²=5+2√10+2=7+2√10 Answer

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Please share Dav maths paper of class 9th

Posted by Ram Shah 4 years, 11 months ago

CBSE > Class 09 > Mathematics

2 answers

Ram Shah 4 years, 10 months ago

Ooofghhhhhhh

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Ram Shah 4 years, 11 months ago

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Show that of all line segments drawn from a given point not on it,rhe perpendicular line segment is the shortest

Posted by Bisla Chingkheimayum 4 years, 11 months ago

CBSE > Class 09 > Mathematics

2 answers

Harpreet Singh 4 years, 11 months ago

Thank you ?

1Thank You

Amanjot Kaur 4 years, 11 months ago

We have a straight line AB. Take a point P not on AB, but some distance away. We draw PC the perpendicular on to AB meeting AB at C. We draw another line from P to D, where D lies on AB. We show that PD > PC, for any point D other than C. In the triangle PCD, use the Pythagorean law for sides: PC² + CD² = DP² Since CD² is positive and adds to PC², PC²+CD² > PC² Hence DP² > PC² So DP > PC SO PC, the perpendicular distance from an external point to a line segment, is the shortest.

4Thank You

ANSWER

Kal mere exam h me kya Karu mujhe kuch samajh nahi aa Raha h

Posted by Vishal Prajapat 4 years, 11 months ago

CBSE > Class 09 > Mathematics

5 answers

Aayush Singh@8 4 years, 11 months ago

Read all the theorems. ❤

2Thank You

Ranjeet Kumar Pandit?? 4 years, 11 months ago

Masti karo jyada tension mat lo warna jo yaad hai usme bhi confusion aa jayega

4Thank You

Tejas Chandanshive 4 years, 11 months ago

जादू करो

4Thank You

Vinita Choudhary 4 years, 11 months ago

Only study

6Thank You

Vishal Prajapat 4 years, 11 months ago

Maths ka h

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ANSWER

π66√63€4-

Posted by Charchit Dahiya 4 years, 11 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Once four friends Rahul Arun

Posted by Avinash Reddy 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Ayush Tiwari 4 years, 11 months ago

Then what to do now.

6Thank You

ANSWER

What is the percentage of the yongest age of group person over those in the oldest age group

Posted by Udit Varshney 4 years, 11 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

What do you understand by the term it and ites

Posted by Sarthak Uniyal 4 years, 11 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Express 0.27 baar on 7 in p/q form.

Posted by Tanay Kabra 4 years, 11 months ago

CBSE > Class 09 > Mathematics

2 answers

Ayush Tiwari 4 years, 11 months ago

Let x be 0.27 bar x = 0.27bar 100x = 100 × 0.27bar 100x = 27.27bar 100x = 27 + 0.27bar 100x = 27 + x (as x is equal to 0.27bar) 100x - x = 27 99x = 27 x = 27/99 x = 3 /11 Therefore, 27bar = 3/11

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Preet Kumar 4 years, 11 months ago

25/90 or 5/12

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Side of a triangle are in the ratio of 12.7.1 t v and its perimeter is 540 cm find its area

Posted by Naitik Mishra 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Preet Kumar 4 years, 11 months ago

9000cm^

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21- Find the value of k , if x = 2 , y = 1 is a solution of the equation 2x +3y =k

Posted by Md Khalid Akhtar 4 years, 11 months ago

CBSE > Class 09 > Mathematics

3 answers

Preet Kumar 4 years, 11 months ago

0Thank You

Naitik Mishra 4 years, 11 months ago

2x+3y k 2(2)+3(1) k 4+3 k 7k answer

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Sayan Biswas 4 years, 11 months ago

Given, x = 2 & y = 1 Now, putting the values of x and y in the equation 2x + 3y = k, we get, 2 × 2 + 3 × 1 = k => 4 + 3 = k . . . k = 7 Hence, the value of 'k' is 7. Thank you...

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21- Write the coefficients of x² in each of the following . a. 2-x² + x b. √2x – 1

Posted by Md Khalid Akhtar 4 years, 11 months ago

CBSE > Class 09 > Mathematics

2 answers

Preet Kumar 4 years, 11 months ago

a.-1 b.0

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Divesha Tomar 4 years, 11 months ago

a. 1 b.√2

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Posted by Md Khalid Akhtar 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Preet Kumar 4 years, 11 months ago

Question toh likh

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In the following figures which point has its abscissa as -3

Posted by Swaroop Karad 4 years, 11 months ago

CBSE > Class 09 > Mathematics

3 answers

Yash Sharma 4 years, 11 months ago

0,0

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Preet Kumar 4 years, 11 months ago

Plz send figure

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Ritika Raghav 4 years, 11 months ago

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If the supplement of an angle is three times its complement find the angle

Posted by Neha Poojary 4 years, 11 months ago

CBSE > Class 09 > Mathematics

5 answers

Preet Kumar 4 years, 11 months ago

270

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Harpreet Singh 4 years, 11 months ago

Given that, Supplement of an angle =3× Complement of an angle. Let the angle be x,then it's supplement will be(180°-x) and complement will be (90°-x). Now, (180°-x)=3(90°-x), 180°-x=270°-3x, -x+3x=270°-180°, 2x=90°, x=45°, Therefore the angle is 45°. Complement will be 45° and Supplement will be 135°.

2Thank You

Harpreet Singh 4 years, 11 months ago

That's wrong

2Thank You

Aniket Singh 4 years, 11 months ago

Tell wrong or right

1Thank You

Aniket Singh 4 years, 11 months ago

270

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ANSWER

The point where x and y axis meet is called _________.