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Junior high school mathematics multiple choice questions
Find the radius r of the circle first.

Circular area =4 times shadow area =40π

So the square of r =40.

The square of the distance from P to the origin = the square of R.

That is, the square of 3a+the square of a =40.

a=2

So p (6,2)

K=6*2= 12

You should choose D.