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Question

In the given right angled isosceles triangle ABC, if AC = 10 cm then the area of triangle (in cm2) is ___.


A

35

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B

45

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C

25

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D

32

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Solution

The correct option is C

25


In right angled isosceles triangle ABC, B = 90

AB=BC

So,θ = α

cos θ = 12 at θ =45

So, ABAC=12

AB=AC2

AB=52 cm

And sinθ =12 at α =45

So, BCAC=12

BC=52cm

Area of triangle=12 (Base × Height)

=12(52 × 52)

=25 cm2


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