Question

the area of an equilateral triangle of side 40 cm is

Answer 1

We know,

Area of an equilateral triangle = √3/4 side×side

= √3/4 ×1600

= √3 × 400

= 1.74 ×400

= 692.82 sq. cm

Answer 2

Answer:

The area of equilateral triangle is 692 square cm.

Step-by-step explanation:

Given : Side of a triangle is 40 cm.

To find : The area of an equilateral triangle?

Solution :

Formula to find area of equilateral triangle is

$A=\frac{\sqrt3}{4}\times side^2$

Side(s)= 40 cm

Substitute the value in the formula,

$A=\frac{\sqrt3}{4}\times s^2$

$A=\frac{\sqrt3}{4}\times (40)^2$

$A=\frac{\sqrt3}{4}\times 1600$

$A=\sqrt3\times400$

$A=1.73\times 400$

$A=692$

Therefore, The area of equilateral triangle is 692 square cm.