Question

an isoceles triangle has perimeter 30 cm and each of thr equal sides is 12cm find the area of the triangle​

Answer 1

Answer:

34.85

Step-by-step explanation:

Equal side(a)=12cm

Unequal side(b)=?

Perimeter=30

Now,

Perimeter=2Equal sides +Unequal side

or,30=2a+b

or,30-2*12=b

or,30-24=b

Therefore, b=6

Again,

Area=1/4b√(4a^2-b^2)=1/4*6√4*12^2-6^2=3/2√540=3/2*23.237=34.85 cm^2