Question

An isosceles triangle has perimeter 30cmand each of the equal side is 12cmfind the area of triangle

Answer 1

Answer:

34.85 cm²

Step-by-step explanation:

perimeter = 30 cm

equal side length = 12 cm

length of other side = 30 = 24+x

                                 = x = 6 cm

using heron's formula,

= $\sqrt{s(s-a)(s-b)(s-c)}$

= semi perimeter = 30/2 = 15 cm

= $\sqrt{15*9*3*3}$

= $9\sqrt{15}$

= 9*3.873

= 34.85 cm²