JAMB - Mathematics (2015 - No. 8)
Find the total surface area of a cylinder of base radius 5cm and length 7cm ( π = 3.14)
17.8cm2
15.8cm2
75.4cm2
54.7cm2
\(377.0cm^{2}\)
Giải thích
The total surface area of a cylinder = 2πrl + 2πr2
= 2πr(l + r)
= 2 × 3.14 x 5(7+5)
2 × 3.14 × 12 x 5
= 377.1cm (1DP)
= 2πr(l + r)
= 2 × 3.14 x 5(7+5)
2 × 3.14 × 12 x 5
= 377.1cm (1DP)