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Mensuration: Areas and Volumes · Question 45 of 68

Question 45

EasyOriginal question

A globe has a radius of 21 cm. What is the area of its surface? Take π=227\pi = \frac{22}{7}.

Options for question 45

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Surface area of a sphere = 4πr24\pi r^2.

  2. = 4×227×21×21=55444 \times \frac{22}{7} \times 21 \times 21 = 5544 cm².

Worth noting

1,386 cm² is πr², a flat circle of the same radius. 2,772 cm² is half the globe, and 4,158 cm² is the surface of a solid hemisphere (3πr²).

Concept
Surface area of a sphere = 4πr²
Typical time
40 s
Your time
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The rule this testsCylinders, cones and spheres
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