Annular area

The square with side a = 1 is inscribed and circumscribed by circles. Find the annular area.

Correct result:

S =  0.7854

Solution:

a=1 r=a/2=1/2=12=0.5 R=2 a/2=2 1/20.7071  S1=π R2=3.1416 0.707121.5708 S2=π r2=3.1416 0.520.7854  S=S1S2=1.57080.7854=0.7854



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