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SAS congruence criterion: If two sides and included an angle of one triangle are equal to the corresponding two sides and included angle of another triangle then the two triangles are said to be congruent.

Consider $\triangle$ ABC, $\triangle$ PQR
here AB = PQ, AC = PR and $\angle$ A = $\angle$ P
Hence $\triangle$ ABC $\cong$ $\triangle$ PQR by SAS congruence criterion.

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Chapter 7

Posted by Swati Chaturvedi 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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Chapter 8 all theorem proof

Posted by Priya Seth 5 years, 10 months ago

CBSE > Class 09 > Mathematics

2 answers

Anshuman Singh 5 years, 10 months ago

Written in NCERT

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Anjali Arya 5 years, 10 months ago

See in your maths book

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Prove that if the diagonal of the quadrilateral bisect each other at 90degree then it is a rhombus.

Posted by Rupali Singh 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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Sia ? 5 years, 10 months ago

Given: Diagonals of quadrilateral intersect each other at right angles.

To Prove: Quadrilateral is a rhombus.
Proof : In $\triangle$ AOB and $\triangle$ AOD,
AO = AO . . . [Common]
OB = OD . . . [Given]
$\angle$ AOB = $\angle$ AOD . . .[Each 90^o]
$\therefore$ $\angle$ AOB $\cong$ $\triangle$ AOD . . . [By SAS property]
$\therefore$ AB = AD . . . [c.p.c.t.] . . . . (1)
Similarly, we can prove that
AB = BC . . . . (2)
BC = CD . . . . (3)
CD = AD . . . . (4)
From (1), (2), (3) and (4)
AB = BC = CD = DA
Since opposite sides of quadrilateral ABCD are equal, it can be said that ABCD is a parallelogram. Since all sides of a parallelogram ABCD are equal, it can be said that ABCD is a rhombus.

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Three coins were tossed simult anesously 200 times with the following frequencies of different outcomes. Out come 3heads 2heads 1head no head frequency 23 72 77 28

Posted by San.Mdip.' Patil 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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sir plz uploads the modal test paper according to new syllabus

Posted by Bindass Jockar 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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x+y=??

Posted by Raunak Jain 5 years, 10 months ago

CBSE > Class 09 > Mathematics

6 answers

Aashish Solanki 5 years, 10 months ago

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Rina Pandey 5 years, 10 months ago

0 , then it will become an equation

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Fiza Kalam 5 years, 10 months ago

X+y=0

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Anjali Arya 5 years, 10 months ago

X+y

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Yaduvanshi Chora 5 years, 10 months ago

X+Y

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Mohammed Maaz Uddin 5 years, 10 months ago

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Show that if daigonals of parralelogram bisect each at right angles , then it is a rhombus

Posted by Vinayak Gupta 5 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Sia ? 5 years, 10 months ago

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Five postulate of Euclid

Posted by Niraj Singh Kushwaha 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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Dpsangwan Choudhary 5 years, 10 months ago

. A straight line segment can be drawn joining any two points. 2. Any straight line segment can be extended indefinitely in a straight line. 3. Given any straight line segment, a circle can be drawn having the segment as radius and one endpoint as center. 4. All right angles are congruent. 5. If two lines are drawn which intersect a third in such a way that the sum of the inner angles on one side is less than two right angles, then the two lines inevitably must intersect each other on that side if extended far enough. This postulate is equivalent to what is known as the parallel postulate.

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Find the factor of (1-x^3)

Posted by Ayushi Maheshwari 5 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Namrata Jindal 5 years, 10 months ago

(1-x) (1-x-x^2)

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Pove that the bisector of a pair of vertically opposite angles are in the Samer straight line

Posted by Ranvijay Kumar 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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You can ask any question from maths

Posted by Yuvraj Singh 5 years, 10 months ago

CBSE > Class 09 > Mathematics

4 answers

Yuvraj Singh 5 years, 10 months ago

E=Energy, M=mass and C=speed of light

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Swaraj Adigopul 5 years, 10 months ago

Then tell that what is E=mc²

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Vatsal Trivedi 5 years, 10 months ago

P vs. NP Problem.

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Yuvraj Singh 5 years, 10 months ago

I've only downloaded CBSE guide for homework. ????

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If surface area =volume of sphere what effact on radius

Posted by Hunting Man Crazy 5 years, 10 months ago

CBSE > Class 09 > Mathematics

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What is congerent triangle

Posted by Rajeev Rajan 5 years, 10 months ago

CBSE > Class 09 > Mathematics

2 answers

Mukul Kumar 5 years, 10 months ago

A congruent triangle is in which when we have 2 triangles these will satisfy each other completely called congruent triangle

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Kulsoom Rizvi 5 years, 10 months ago

Do you mean congruent triangle?

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10+√20+√40+√60

Posted by Golve Sree Shashank 5 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Golve Sree Shashank 5 years, 10 months ago

√2+√3+√5

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Factorise 8a cube+b cube+12a square b+6ab square

Posted by Reshika Navy 5 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Parul Goenka 5 years, 10 months ago

In this we will use identify of (a+b)^3 If the equation is 8a^3+b^3+12a^2b+6ab^2 Then a is 2a and b is b So after putting identity the answer is (2a+b)^3 or (2a+b)(2a+b)(2a+b)

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x=5+2, then x-1/x =?

Posted by Govind Ram Saini 5 years, 10 months ago

CBSE > Class 09 > Mathematics