A solid cylinder of radius 7cm is 10 cm long. Find its total surface area.
70πcm2
189πcm2
210πcm2
238πcm2
Correct answer is D
S = 2πr2+2πrh
= 2πr(r+h)
= 2π(7)(7+10)
= 238πcm2
47cm
61cm
88cm
231cm
Correct answer is B
Perimeter of the sector = 2r + \frac{\theta}{360} \times 2\pi r
= 2(14) + \frac{135}{360} \times 2 \times \frac{22}{7} \times 14
= 28 + 33
= 61 cm