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Step-by-step explanation:

First let's find the circle without the gray area. We would have:

Next let's find the area of the circle with the gray area. We would have:

Now we subtract and get:

HOPE THIS HELPS

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23