Find the area of an equilateral triangle having each side of length 10 cm.
Question:

Find the area of an equilateral triangle having each side of length 10 cm.

Solution:

Given:
Side of the equilateral triangle = 10 cm
Thus, we have:

Area of the equilateral triangle $=\frac{\sqrt{3}}{4}$ side $^{2}$

$=\frac{\sqrt{3}}{4} \times 10 \times 10$

$=25 \times 1.732$

$=43.3 \mathrm{~cm}^{2}$