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25 July, 05:59

A solid cylinder of radius 7cm is 10cm long. find it's total surface area

a. 70πcm3

b. 210πcm3

c. 238πcm3

d. 189πcm3

Answers (2)
  1. A
    25 July, 06:05
    0
    c. 238πcm3

    Step-by-step explanation:

    Total surface area =

    2pirh + 2pir^2

    Given radius r = 7cm and

    Height h = 10cm

    Total surface area = 2 x pi x 7 x 10 + 2 x pi x (7) ^2

    140pi + 2 x pi x 49

    140pi + 98pi

    238pi cm^3
  2. G
    25 July, 06:50
    0
    C. 238π cm^3.

    Step-by-step explanation:

    Surface area = 2 * area of the circular ends + area of the curved length

    = 2π r^2 + 2π r * l

    = 2 π 7^2 + 2π 7 * 10

    = 98π + 140π

    = 238π cm^3.
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