Question

Heroic formula find the area of equilateral triangle whose perimeter
is 90 cm​

Answer 1

Step-by-step explanation:

Given :

Perimeter of equilateral triangle=90cm

To find :

Area of equilateral triangle

Solution :

a+b+c=90cm...(formula for perimeter of triangle)

3a=90(a=b=c)

a=30

$area \: of \: triangle = \frac{ \sqrt{3} }{4} \times {a}^{2}$

=12.990 cm²

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