The perimeter of an isosceles triangle is 252cm if the length of its unequal sides 72 cm.find the length of its equal side.

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Solution

Dear student,
$L e t' x' b e t h e e q u a l s i d e o f a n i s s o s c e l e s t r i a n g l e w e k n o w, P e r i m e t e r o f t r i a n g l e = s u m o f a l l s i d e s \Rightarrow 252 = x + x + 72 \Rightarrow 252 - 72 = 2 x \Rightarrow 180 = 2 x \Rightarrow x = 90 c m T h u s t h e l e n g t h o f e q u a l s i d e s a r e 90 c m e a c h .$
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