Question

an isosceles triangle has perimeter 30cm and each of sides is 12cm. find the area of the area of triangle
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Answer 1

Answer:

Let third side of triangle x

⇒Perimeter =30 cm

semiperimeter(s)=perimeter/2

⇒2S=30,S=15

⇒12+12+x=30 ⇒ x=6

A=√s(s−a)(s−b)(s−c)[heron's formula]

A=√15(15-12)(15-12)(15-6)=√15×3×3×9

A=9√15cm*2

Hope it will help you ✌️✌️