Book Maths Puzzle Geometry

A triangle encloses a circle, is tangent to it at three points and the circle has a radius of three. we need the area of one region of the triangle outside the circle.

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Book Other Question

I have a equation.

(x+1) exponent is 2/5 - 3(x+1) exponent is 1/5 - 2=0

I know how to get to the answer replacing (x+1)1/5 with U to the 2nd power, but I don't understand w
20% of what number is 8? How do you figure this? or how would you get the answer?