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Question

Find the area of an isosceles triangle each of whose equal sides measures 13 cm and whose base measures 20 cm.

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Solution

We have,
Three sides13cm,13cm and 20cm.
By using Heron's formula
We need to get the semi-perimeter
s=a+b+c2=13+13+202
=462=23
Now,
put the heron's formula,
s=s(sa)(sb)(sc)
=23(2313)(2313)(2320)
=23×10×10×3
=1023×3
=83.07cm2

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Area of an Isosceles Triangle
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