Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:
The total surface area of a right circular cylinder with radius of the base 7 cm and height 20 cm is [SSC-CHSL (10+2) Exam, 2015]
(a)$900 \mathrm{cm}^{2}$
(b)$140 \mathrm{cm}^{2}$
(c)$1000 \mathrm{cm}^{2}$
(d)$1188 \mathrm{cm}^{2}$
Answer
Answer (as printed): D
Explanation
Radius and height of a right circular cylinder is 7cm and 20 cm respectively. Total surface area of right circular cylinder $=2 \pi r h+2 \pi r^{2}$ $$\begin{aligned} & =2 \pi r(h+r) \\ & =2 \times \frac{22}{7} \times 7(20+7) \end{aligned}$$ $=2 \times 22 \times 27=1188$ sq. cm.
Explanation as extracted from the printed page; notation may be imperfect.