RS Aggarwal & V Aggarwal - Mathematics

Book: RS Aggarwal & V Aggarwal - Mathematics

Chapter: 7. Areas

Subject: Mathematics - Class 9th

Q. No. 24 of CCE Questions

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The question consists of two statements namely, Assertion (a) and Reason (R). Please select the correct answer.

Assertion (A)

Reason (R)

The area of an isosceles triangle having base = 24 cm and each of the equal sides equal to 13cm is 60cm2.

If 2s = (a + b+ c) where a, b, c are the sides of a triangle, then area = .

From the given question, we have

a = 24 cm, b = 13 cm and c = 13 cm

s =



= 25 cm

Now, by using heron’s formula we have:

Area of triangle =



= 5 × 12

= 60 cm2

Also, if 2s = (a + b + c) where a, b and c are the sides of the triangle then:

Area =

Assertion and reason both are correct

Hence, option (a) is correct

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