Question

Perimeter of an equilateral triangle is18 c.m.its area is:

Answer 1

Answer:

Let each side be x cm

3x = 18

x = 18/3

=6 cm

s= a + b + c/2

s= 9 cm

According to heron's formula,

Area = under root 9*3*3*3

= 9under root 3

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Answer 2

Answer:

Perimeter of an equilateral triangle =18

let side of the triangle is 'x'

Perimeter of the triangle=3x=18

x=18/3

x=6cm

area of the triangle = √s(s-a)(s-b)(s-c)

first we find s, s=a+b+c/2

6+6+6/2=18/2

s=9

√s(s-a)(s-b)(s-c)

√9(9-6)(9-6)(9-6)

√9*3*3*3

√3*3*3*3*3

3*3√3

9√3Ans

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