Fit ball

What is the size of the surface of Gymball (FIT - ball) with a diameter of 65 cm?

Correct result:

S =  13273.229 cm2

Solution:

D=65 r=D/2=65/2=652=32.5 S=π⋅ D2=3.1416⋅ 652=13273.229 cm2=1.327⋅104 cm2

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