Question

find the area of an isosceles triangle having the length of equal sides 8 cm and the perimeter 30 cm. ​

Answer 1

Answer:

25.9cm²

Step-by-step explanation:

Perimeter=30cm

Semiperimeter=P/2=15cm

Perimeter=a+b+c=30

since its isosceles so let's take a and b as equal sides ( 8cm) and c as base.

2a+c=30

=>2×8+c=30

=>c=14cm

Area=√{s(s-a)(s-b)(s-c)}

=√(15×7×7×1)

=7√15

=7×3.7

=25.9cm²