A sphere has diameter 28 cm. If the diameter is divided by 2, what is the effect on the surface area?
1 answer:
Answer:
The surface area is divided by 4.
Step-by-step explanation:
Surface area of a sphere is 4πr².
When the diameter is 28 the radius is 14. So: 4π(14)² = 784π
If you cut the diameter in half you get 14. The radius is now 7.
4π(7)² = 196π.
784/4 = 196 so divided by 4.
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If you have any questions about the way I solved it, don't hesitate to ask me in the comments below :)
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