Question

the perimeter of an equilateral triangle is 60m.find its area.

Answer 1

Perimeter= 60m
Measurement ofOne side =20m
Semiperemeter=30m

By using herons formula
$\sqrt{30(30 - 20)(30 - 20)} (30 - 20)$
$\sqrt{30 \times 10 \times 10 \times 10}$
$\sqrt{3 \times 10 \times 10 \times 10 \times 10}$

Answer 2

the length of one side of the triangle is equal to other sides..
means : all sides r equal of equilateral triangle..
so the length of one side = 60/3 = 20 cm.

the formula of equilateral triangle
= √3/4 (a)^2
=√3/4 (20)^2
= √3/4 (400)
=100√3
= 100 × 1.732 ( √3 = 1.732 )
= 173.2 (answer)

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