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

Let E and F are midpoints of the diagonals AC and BD of trapezium ABCD respectively. Draw DE and produce it to meet AB at G Consider △AEG and △CED ⇒ ∠AEG=∠CED [ Vertically opposite angles ] ⇒ AE=EC [ E is midpoint of AC ] ⇒ ∠ECD=∠EAG [ Alternate angles ] ⇒ △AEG≅△CED [ By SAA congruence rule ] ⇒ DE=EG ---- ( 1 ) [ CPCT ] ⇒ AG=CD ----- ( 2 ) In △DGB E is the midpoint of DG [ From ( 1 ) ] F is midpoint of BD ∴ EF∥GB ⇒ EF∥AB [ Since GB is part of AB ] ⇒ EF is parallel to AB and CD. Also, EF=21GB ⇒ EF=21(AB−AG) ⇒ EF=21(AB−CD) [ From ( 2 ) ]

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The floor of a rectangular hall has a perimeter 250m

Posted by Mansi Bhati 2 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Aman Harsh 2 years, 10 months ago

What find this question

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if two chords of congruent circles are equal then the corresponding arcs are congruent

Posted by Shifa Siddiqui 2 years, 10 months ago

CBSE > Class 09 > Mathematics

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Excrises 1.3 question no 4 4 expression 0.99999......in the lform pare you surprised by your answer? With a your teacher and friend disovss why the answer makes sense

Posted by Sahil Sharma 2 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Ruquaiyya Azad 2 years, 10 months ago

Value 0.9999 is not equal to but aprox 1

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2+1-3+4-5+6-7+8-9+10-11=?

Posted by Aman Harsh 2 years, 10 months ago

CBSE > Class 09 > Mathematics

5 answers

Vanshika Shrivastava 2 years, 10 months ago

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Naina .... 2 years, 10 months ago

-4

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Carz Lover 2 years, 10 months ago

-4

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Vinit Kumar Sonkaria 2 years, 10 months ago

10 ans

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Tanu Thakur 2 years, 10 months ago

-4ans

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Which of the following is not a linear equations 7 upon 3 x minus 5 equal to 4 x minus 3 X square + 5 equal to 3 x minus 5 3 + 3 = 25 x + 2 X + 2 whole square equal to x square - 8

Posted by Akshay Mishra 2 years, 10 months ago

CBSE > Class 09 > Mathematics

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On multiplying 5√2 and 3√2-7 we get

Posted by Shalini Yadav 2 years, 10 months ago

CBSE > Class 09 > Mathematics

3 answers

Bhumika Soni 2 years, 10 months ago

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Aman Harsh 2 years, 10 months ago

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Priyanshi Shakya 2 years, 10 months ago

-23.87

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The perimeter of a rectangle is 120 cm and its length is 40 cm find the area of the rectangle anyone can give this answer

Posted by Anshul Dabral 2 years, 10 months ago

CBSE > Class 09 > Mathematics

4 answers

Devjeet Prajapati 2 years, 10 months ago

PERIMETER=120CM LENGTH=40CM BREADTH=? PERIMETER OF RECTANGLE= 2(L+B) 120=2(40+B) 120=80+2B 120-80=2B 40=2B B=40/2 B= 20CM BREADTH = 20 CM AREA OF RECTANGLE= L*B = 40*20 = 800CM²

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Devjeet Prajapati 2 years, 10 months ago

PERIMETER=120CM LENGTH=40CM BREADTH=? PERIMETER OF RECTANGLE= 2(L+B) 120=2(40+B) 120=80+2B 120-80=2B 40=2B B=40/2 B= 20CM BREADTH = 20 CM ARE OF RECTANGLE= L*B = 40*20 = 800CM²

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Jaydeep Bhinde 2 years, 10 months ago

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Ashish Mahato 2 years, 10 months ago

800cmsquare

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The perimeter of a rectangle is 120 cm and its length is 40 cm find its find the area of a rectangle

Posted by Anshul Dabral 2 years, 10 months ago

CBSE > Class 09 > Mathematics

2 answers

Aakanksha Rani 2 years, 10 months ago

Given : perimeter = 120cm Length=40cm according to question, 2(l+b)=perimeter of rectangle 2(40+b)=120 80+2b=120 2b=120-80 b=40/2 b=20 Now, Area of rectangle=l*b 20*40 800cm²

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Ashish Mahato 2 years, 10 months ago

800cmsquare

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What is the value of π ?

Posted by Adarsh Dubey 2 years, 10 months ago

CBSE > Class 09 > Mathematics

5 answers

Saloni Shekhawat 2 years, 10 months ago

22/7

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Pratik Jain 2 years, 10 months ago

3.14

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Pratik Jain 2 years, 10 months ago

22»

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Shaad Shaikh 2 years, 10 months ago

3.14

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Ravidutt Sharma 2 years, 10 months ago

22/7

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The angles of the quadrilateral are in the ratio 3:5:9:13 find all the angles of the quadrilateral

Posted by Rashi Jamwal 2 years, 10 months ago

CBSE > Class 09 > Mathematics

3 answers

Aditya Raj 2 years, 10 months ago

Let the angles be 3x, 5x, 9x, and 13x. The total angle sum of quadrilateral is 360°. Therefore, 3x + 5x + 9x + 13x = 360° 30x = 360° x = 360°/30 x = 12 3x=12*3 = 36° 5x = 12*5 = 60° 9x = 12*9 = 108° 13x = 12*13 = 156°

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Shivansh Kumar Srivastava 2 years, 10 months ago

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Kumkum Rajput 2 years, 10 months ago

36,60,45,65

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15/√10+√20+√40-√5-√80 if √5=2.236and √10 =3.162 ???

Posted by Arushi Patel 2 years, 10 months ago

CBSE > Class 09 > Mathematics