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Ans. Given: In quadrilateral ABCD, AC = AD and AB bisects A. To prove: ABC ABD Proof: In ABC and ABD, AC = AD [Given] BAC = BAD [ AB bisects A] AB = AB [Common] ABC ABD [By SAS congruency] Thus BC = BD [By C.P.C.T.]

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12 ×2

Posted by Mehander Kumar 8 years, 3 months ago

CBSE > Class 09 > Mathematics

4 answers

Vidhi Sharma 8 years, 3 months ago

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Anishka Arora 8 years, 3 months ago

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Rohitansh Pathania 8 years, 3 months ago

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Pawni Chaudhary 8 years, 3 months ago

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Exercise 7.1

Posted by Ayan Manna 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Pawni Chaudhary 8 years, 3 months ago

myCBSEguide.com myCBSEguide.com Download myCBSEguide mobile app for FREE sample papers, last year papers, NCERT solutions, test papers, online tests, practice papers and many more features. Install App Now NCERT Solutions class-9 Maths Exercise 7.1 1 year agoAdd Commentby myCBSEguide2 Views FacebookTwitterGoogle+PinterestWhatsApp 1. In quadrilateral ABCD (See figure). AC = AD and AB bisects A. Show that ABC ABD. What can you say about BC and BD? Ans. Given: In quadrilateral ABCD, AC = AD and AB bisects A. To prove: ABC ABD Proof: In ABC and ABD, AC = AD [Given] BAC = BAD [ AB bisects A] AB = AB [Common] ABC ABD [By SAS congruency] Thus BC = BD [By C.P.C.T.] 2. ABCD is a quadrilateral in which AD = BC and DAB = CBA. (See figure). Prove that: (i) ABD BAC (ii) BD = AC (iii) ABD = BAC Ans. (i) In ABC and ABD, BC = AD [Given] DAB = CBA [Given] AB = AB [Common] ABC ABD [By SAS congruency] Thus AC = BD [By C.P.C.T.] (ii) Since ABC ABD AC = BD [By C.P.C.T.] (iii) Since ABC ABD ABD = BAC [By C.P.C.T.] 3. AD and BC are equal perpendiculars to a line segment AB. Show that CD bisects AB (See figure) Ans. In BOC and AOD, OBC = OAD = [Given] BOC = AOD [Vertically Opposite angles] BC = AD [Given] BOC AOD [By ASA congruency] OB = OA and OC = OD [By C.P.C.T.] 4. and are two parallel lines intersected by another pair of parallel lines and (See figure). Show that ABC CDA. Ans. AC being a transversal. [Given] Therefore DAC = ACB [Alternate an

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2^2+3^3

Posted by Ritik Kumar 8 years, 3 months ago

CBSE > Class 09 > Mathematics

2 answers

Pawni Chaudhary 8 years, 3 months ago

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Aman Keshri 8 years, 3 months ago

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Pie value

Posted by Rishav Jaat 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Pawni Chaudhary 8 years, 3 months ago

3.14159 or22/7

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If C is called a mid point of line segment AB. Prove that line segment has one and only one mid point

Posted by Yatharth Seth 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Deepika Singh 8 years, 3 months ago

let C and D be 2 mid points of line segment AB.
since C is the mid point , AC=CB=1/2 AB
similarily AD=BD=1/2 AB
thus AC=AD
AD+CD=AD
therefore CD=0 units or C collides with D
hence every line segment has one and only one midpoint.

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Sides of a triangle are in the ratio of 12:17:25 and its perimeter is 540 cm .find ifs area

Posted by Yash Deep 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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ABCD is a parallelogram.If ab=2ad and p is the mid-point of ab,then find <cpd

Posted by Soumodeep Paul 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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Points p and a have been taken on opposite sides ab and CD respectively of a parallelogram abcd such that ap =cq .show that A.C. and Pq bisect each other

Posted by L M 8 years, 3 months ago

CBSE > Class 09 > Mathematics

0 answers

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Wt is polynomial

Posted by Rajeswari Telukula 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Raghupathruni Shivatej 8 years, 3 months ago

An expression which contains four terms is polynomial

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Find the measures of Angle which is complement of itself

Posted by Sneha Gupta 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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12+3

Posted by Kritika Bhalla 8 years, 3 months ago

CBSE > Class 09 > Mathematics

3 answers

Rishita Garg 8 years, 3 months ago

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Aryan Choudhary 8 years, 3 months ago

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Arivarasan Mbbs 8 years, 3 months ago

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X+1/x=55 ,x^2+1/x^2=?

Posted by Aksh Raj 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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4power (2x- - 16 power( x-1) =384

Posted by Karan Tiwari 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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If x=27 and find the value of (x+y)2

Posted by Shubham Gaur 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Harshdeep Mishra 8 years, 3 months ago

If x=27 Then( 27+y)2 = 729+y2 Y2= -729 Y=√-729 Y= -27

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Is zero an integer?

Posted by Nakul Sangal 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Parijat Sinha 8 years, 3 months ago

Yes .because all postive,negative counting numbers together with zero is called integers

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Is zero an integar

Posted by Rajat Gera 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Aadi Gupta 8 years, 3 months ago

Yes

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If two straight lines are perpendicular to the same line,prove that they are parallel to each other.

Posted by Vikash Kumar 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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Find the values of a and b so that the polynomial(x^4+ax^3-7x^2+8x+b) is exactly divisible by (x +2) as well as (x +3)

Posted by Prashant Goyal 8 years, 3 months ago

CBSE > Class 09 > Mathematics

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Prove that each angle of an equilateral triangle is 60°

Posted by Piyush Meena 8 years, 3 months ago

CBSE > Class 09 > Mathematics

3 answers

Shivam Singh 8 years, 3 months ago

X=60

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Rajeswari Telukula 8 years, 3 months ago

We already know that in a equilateral triangle all sides and angles are equal. In the question there was no measurements so we can say that all angles be x, x, x, then X+x+x =180 3x = 180 x= 60

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Jatin . 8 years, 3 months ago

X+X+X= 180 3X=180 X=180÷ 3 EACH ANGLE =60

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quadrilateral

Posted by Vishal Verma 8 years, 3 months ago

CBSE > Class 09 > Mathematics