Question

The isosceles triangle has perimeter 40cm and each of the equal side is 15cm. Find the area of the triangle.
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Answer 1

Step-by-step explanation:

formula for this

perimeter = s + s + s

40 = 15 + 15 + s

40 = 30 + s

s = 40-30

side = 10

formula of area is

s = a+b+c/2

s = 15+15+10/2

s = 20

area = √s(s-a)(s-b)(s-c)

area = √20 (20-15) (20-15) (20-10)

area = √20 x 5 x 5 x 10

area √2 x 10 x 5 x 5 x10

area = 50√2 cm^2

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