What is the area (in sq cm) of an equilateral triangle of side 21 cm?
Answer & explanation
Correct answer: option 1
Area of equilateral triangle = \(\frac{ \sqrt{3}}{4}\)a2
= \(\frac{ \sqrt{3}}{4}\) × 21 × 21
= \(\frac{441}{4}\)\(\sqrt{3}\) cm2
What is the area (in sq cm) of an equilateral triangle of side 21 cm?
Correct answer: option 1
Area of equilateral triangle = \(\frac{ \sqrt{3}}{4}\)a2
= \(\frac{ \sqrt{3}}{4}\) × 21 × 21
= \(\frac{441}{4}\)\(\sqrt{3}\) cm2