Question

the base of an isosceles triangle is 12 cm and its perimeter is 32cm. find its area

Answer 1

Let's take unknown side is x
Now
x+x+12=32
2x=20
x=10
Since isosceles triangle have 2 equal sides
so sides would be
10, 10, 12
Now apply heron formula

$\sqrt{s(s - a)(s - b)(s - c)}$
where s= (a+b+c)/2