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Key Concept Quiz 8.6
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1
The Oriental Pearl TV Tower in Shanghai, China, uses several spheres in its construction. The middle sphere has a radius of 20 m. Find the surface area of the sphere.
A)251.3 m2
B)1256.6 m2
C)5026.5 m2
D)20 106.2 m2
2
The sphere in question#1 was polished using a compound that costs $25 per tube. Each tube covers 20 m2. What is the cost of the compound required to polish the sphere?
A)$4021.20
B)$6283.19
C)$125 662.50
D)$2 513 250.00
3
The smallest sphere in the TV Tower shown in question#1 has a surface area of 620 m2. What is the radius of the sphere?
A)7.0 m
B)12.4 m
C)14.0 m
D)24.9 m
4
A ping pong ball has a diameter of 4.0 cm. Find the surface area of the ball.
A)12.6 cm2
B)25.1 cm2
C)36.4 cm2
D)50.3 cm2
5
Casey is planning to paint 15 ping pong balls with graphite solution to use in his science class for an electrostatics experiment. Each vial of graphite solution covers 400 cm2 and costs $4.50. What will it cost to buy enough graphite solution to paint the ping pong balls?
A)$4.50
B)$8.48
C)$9.00
D)$13.50





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