Question

a side of an equilateral triangle is 20 cm find its height and area​

Answer 1

HEIGHT

$h = \sqrt{20 {}^{2} - 10 {}^{2} } \: cm \\ h = \sqrt{300} cm \\ h = 10 \sqrt{3} \: cm$

AREA

$a = \frac{1}{2} \times base \times height \\ a = \frac{1}{2} \times 20 \times 10 \sqrt{3} \: cm {}^{2} \\ a = 100 \sqrt{3} \: cm {}^{2}$

Answer 2

Step-by-step explanation:

use this formula to get the answer...