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 R2−r2=52 S=π⋅ R2−π⋅ r2 S=π⋅ (R2−r2)  S=π⋅ 52=3.1416⋅ 52=78.5398 cm2

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