Question

find the area pf isoceles triangle whose equal side are 12cm each and perimetre is 30cm

Answer 1

perimeter of isosceles triangle is 2a+ b. so different side is 6cm by useing heroes formula you will get area

Answer 2

Hey friend!
Here is your answer.

Perimeter of triangle = 30cm

12+12+b= 30
b= 30-24
b= 6cm
$area \: of \: isosceles \: triangle = \frac{1}{2} \times b \times \sqrt{ {a}^{2} - \frac{ {b}^{2} }{4} } \\ \frac{1}{2} \times 6 \times \sqrt{ {12}^{2} - \frac{ {6}^{2} }{4} } \\ 3 \times \sqrt{144 - \frac{36}{4} } \\ 3 \times \sqrt{144 - 9} \\ 3 \times \sqrt{135} \\ 34.8568 {cm}^{2}$
Thank You.


Hope this will be helpful for you.