WAEC - Mathematics (2020 - No. 17)
A solid cuboid has a length of 7 cm, a width of 5 cm, and a height of 4 cm. Calculate its total surface area.
280 cm\(^2\)
166 cm\(^2\)
140 cm\(^2\)
83 cm\(^2\)
Giải thích
Total = 2(LB + BH + LH)
Surface area
= 2(7 x 5 + 5 x 4 + 7 x 4)
= 2(35 + 20 + 28)
= 2(83)
= 166cm\(^2\)