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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

High School Mathematics
4.20 Word Problems on Sphere - II

Example:
The radius of a sphere is 14 cm. to paint the surface of the sphere at 2 cents per 1 Sq. cm. how much will it cost?
Solution:
Given that,
Radius of the sphere = 14 cm.
Surface area of the sphere = 4 * pi * r2
= 4 * 22/7 * 14 * 14
= 88 * 2 * 14
= 2464 Sq. cm.
Cost to paint to surface = 2 cents per 1 Sq. cm.
Total cost of painting the the surface = 2464 * 2
= 4928 cents
= $49.28
Directions: Solve the following problems. Also write at least 5 examples of your own.
Q 1: The radius of a sphere is 17.5 cm. to paint the surface of the sphere at 4 cents per 1 Sq. cm. how much will it cost?
$ 154
$ 152
$ 156
$ 158

Q 2: The radius of a sphere is 10.5 cm. to paint the surface of the sphere at 3 cents per 1 Sq. cm. how much will it cost?
$ 41.78
$ 41.85
$ 41.87
$ 41.58

Q 3: The radius of a sphere is 25.2 cm. to paint the surface of the sphere at 5 cents per 1 Sq. cm. how much will it cost?
$ 399.618
$ 399.816
$ 399.186
$ 399.168

Q 4: The radius of a sphere is 3.5 cm. to paint the surface of the sphere at 5 cents per 1 Sq. cm. how much will it cost?
$ 7.50
$ 7.70
$ 7.25
$ 7.75

Q 5: The radius of a sphere is 44.1 cm. to paint the surface of the sphere at 2 cents per 1 Sq. cm. how much will it cost?
$ 488.8908
$ 488.0988
$ 488.9088
$ 488.9808

Q 6: The radius of a sphere is 4.2 cm. to paint the surface of the sphere at 6 cents per 1 Sq. cm. how much will it cost?
$ 13.3056
$ 13.0635
$ 13.0563
$ 13.3065

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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