is a horizontal line. So the area under 
on [0, 8] is equal to the area of a rectangle with length 8 and height 2, or 16.
is the upper half of a circle with radius 
. It's symmetric about 
, so on the interval [0, 8], we're considering a quarter of the circle. The area of such a sector is 
.
Evaluating integral by net area
...
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