A cylinder, opened at one end, has a radius of 3.5cm and height 8cm. calculate...
MATHEMATICS
WAEC 2022
A cylinder, opened at one end, has a radius of 3.5cm and height 8cm. calculate the total surface area
- A. 126.5cm2
- B. 165.0cm2
- C. 212.0cm2
- D. 214.5cm2
Correct Answer: D. 214.5cm2
Explanation
The surface area of an open-top cylinder = πr(r + 2h),
where 'r' is the radius and 'h' is the height of the cylinder.
= \(\frac{22}{7}\) * 3.5 (3.5 + 2 * 8)
= 11 (3.5 + 16) → 11 (19.5)
= 214.5cm\(^2\)
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *