Circle annulus

There are 2 concentric circles in the figure. Chord of larger circle 10 cm long is tangent to the smaller circle. What are does annulus have?

Correct result:

S =  78.5398 cm2

Solution:

R2=(10/2)2+r2 R2r2=52 S=π R2π r2 S=π (R2r2)  S=π 52=3.1416 52=78.5398 cm2



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