Sphere Crystal
math help!!!!area of a sphere?
1. Emily is placing a gazing ball in one of her customer's gardens. The ball has a diameter of 60cm and will be covered with reflective crystals. one jar of these crystals covers 1m2 (cubed).
a) calculate the surface area, to the nearest square centimetre.
2. the radius of a sphere is 15cm.
a) predict how much the surface area increases if the radius increases by 2cm.
b) calculate the change in surface area, to the nearest square centimetre.
c) how accurate was your prediction?
3. a spherical balloon is blown up from a diameter of 10cm to a diameter of 30cm. by what factor has its surface area increased?
SHOW ALL WORK
1.
a) 11,310
2.
a) 805
b) and c) It's the same... LoL... I didn't predict, I figured it out, so you'll have to "wing that one in".
3.
It's gone from 314.159 to 2827.433
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