Question

An equilateral triangle whose sides 20cm ,then find its area​

Answer 1

Answer:

Area=root3/4 a^2

=root 3/4 X 20X20

Root3 X 100

=100root3

Answer 2

Answer:

$side \: of \: equilateral \: triangle = 20cm. \\ area \: of \: equilateral \: triangle = \frac{ \sqrt{3} }{4} {a}^{2} \\ \: \: \: = \frac{ \sqrt{3} }{4} \times 20 \times 20 = 100 \sqrt{3} {cm}^{2}$