Annulus

The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.

Correct result:

S =  122.5221 cm2

Solution:

r1=8 cm r2=5 cm  S1=π⋅ r12=3.1416⋅ 82≐201.0619 S2=π⋅ r22=3.1416⋅ 52≐78.5398 S=S1−S2=201.0619−78.5398=122.5221 cm2

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