Circular sector

I have a circular sector with a length 15 cm with an unknown central angle. It is inscribed by a circle with radius 5 cm. What is the central angle alpha in the circular sector?

Correct result:

A =  0 °

Solution:

r(2+A)=15 r2=5 cm cosA/2=r2/(rr2) o2=2π r2=2 3.1416 531.4159 cm  =2π5=31.415 cm>15 cm o1<o2 A=P=0=0=0



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