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AleksandrR [38]
3 years ago
6

What is the radius of a sphere that has a surface area of 12.56 in2? use 3.14 for pi. recall the formula sa=4 pi r 2?

Mathematics
2 answers:
Luden [163]3 years ago
8 0
SA=4pir²

given SA=12.56

12.56=4pir²
divide both sides by 4
3.14=pir²
3.14=3.14r²
divide both sides by 3.14
1=r²
sqrt both sides
1=r
the radius is 1 in
Cloud [144]3 years ago
6 0

Answer:

r=1 in

Step-by-step explanation:

Given: The surface area of a sphere is 12.56 in^2.

To find: The radius of the sphere.

Solution: It is given that the surface area of a sphere is 12.56 in^2, thus we have

S.A=4{\pi}r^2 where r is the radius of the sphere.

⇒12.56=4(3.14)(r)

⇒12.56=12.56r

⇒\frac{12.56}{12.56}=r

⇒r=1 in

Therefore, the radius of the sphere is 1 inches.

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