The base of a right prism is an equilateral triangle whose side is 20 cm. If the height of this prism is 20\(\sqrt {3}\) cm, then what is the total surface area of prism?
Answer & explanation
Correct answer: option 3
Total surface area of prism = CSA + 2 × base area
= Base perimeter × Height + 2 × Base Area
= 60 × 20\(\sqrt {3}\) + 2 × \(\frac{\sqrt {3}}{4}\) × 20 × 20
= 1200\(\sqrt {3}\) + 200\(\sqrt {3}\) = 1400\(\sqrt {3}\) cm2