book Maths Puzzle Numerical Ability

Find the area of a segment of a circle if the diameter is 12 inches and the central angle is pi/4 radians?

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Please help!

Solve.

(x/x-9) - 4 = (9/x-9)

thanks 2/7x2&1/8x3=(the answers are........6&1/28, 9/4, 1&23/28, or none of these)