Evaluate the integral below by interpreting it in terms of a partial circle area. in other words, draw a picture of the region the integral represents, and find the area using high school geometry.
-9 to 9 sqrt(81-x^2)dx

no

explanation:

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step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus