Area of Regular Five-Pointed Star

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Problem
Find the area of the regular five-pointed star inscribed in a circle of radius 20 cm.
 

Solution

 

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Comments

Re: Area of Regular Five-Pointed Star

this can't be right... the area of the circle is roughly 10 x 10 x 3,14=314 cm2, how can the area of the star inside it be 450 cm2?

Re: Area of Regular Five-Pointed Star

Look closely the problem here states a 20cm "radius" I think your looking in a question 20cm diameter :) the area of the circle here is 400pi so this is correct.

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