The height of an equilateral triangle is 9√3 cm. What is its area?
Correct answer A. 81√3 sq cm
Explanation
Height of an equilateral triangle = (√3/2) x side, so side = 9√3 x 2/√3 = 18 cm. Area = (√3/4) x 18² = 81√3 sq cm.
Answer checked How we write and check questions
Discussion