Two thirds is equal to 66.666666 etc. percent so 64 is pretty close to 66 so I would consider it right.
The radius is 5cm
Step-by-step explanation:
The surface area of a sphere is given by:

Here
Given
SA = 100π cm^2
Putting the values in the formula

Taking square root on both sides

The radius is 5cm
Keywords: Surface area, Radius
Learn more about surface area of sphere at:
#LearnwithBrainly
Answer:
34, 1.5, 9, 12, 3.6
Step-by-step explanation:
40.8/1.2=
1.8/1.2=
10.8/1.2=
14.4/1.2=
4.32/1.2=