book Maths Puzzle Numerical Ability

What is the area of the sector of a 24 inch diameter circle where the distance "h" is 3 inches? "h" is the maximum distance from the outside of the circle to the chord.

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Hello again. I have one more question and then I'll try to figure out the rest of them on my own. Again, I'd appreciate any help.

Dave has $40,000 to invest. He invests part {(x+2)-y}{(X+2)+y}

is this a perfect square