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If the surface area of a sphere is 16 m2, find the radius.
4 pi r2 | 4 pi = SA | 4 pi
cross out 4 pi till left with r2
r2 = SA |4 pi
./r = ./SA|4 pi
r = ./SA|4 pi
r = ./16| 4 pi
= 1.13m
./ means root
| means divided or over
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