Round skirt

The cut on the round skirt has the shape of an annulus. Determine how much m² of fabric will be consumed on an 80 cm long skirt. The circumference of the waist is a circle with a smaller radius and is 69 cm.

Correct result:

S =  2.5626 m2

Solution:

o1=69 cm m=69/100  m=0.69 m r1=o1/(2π)=0.69/(2 3.1416)0.1098 m  x=80 cm m=80/100  m=0.8 m r2=r1+x=0.1098+0.80.9098 m  S1=π r12=3.1416 0.109820.0379 m2 S2=π r22=3.1416 0.909822.6005 m2  S=S2S1=2.60050.0379=2.5626 m2



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