JAMB - Mathematics (2018 - No. 56)
Calculate the area of an equilateral triangle of side 8cm
8√3
16
4√3
16√3
Giải thích
An equilateral triangle has all sides equal and all angles equal as 600
Area = \(\frac{1}{2}\) absinθ
Area = \(\frac{1}{2}\) x 8 x 8 x sin60
= \(\frac{1}{2}\) x 64 x \(\sqrt{\frac{3}{2}}\)
= 16√3 cm\(^2\)