exam Maths Puzzle Numerical Ability

I hve a 5x5 square. Inside the square there is a semicircle that is shaded from the right corner to the left bottom corner about a fourth in depth. What is the area of the square

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another problem that needs help! thanks so much

Perform the indicated operations and write the answer in the form a+bi
(6+i^2) - (10 - sq root of -9) + (5 + sq root 0f -64) determine which two equation represent perpendicular lines.

a) y=4/7x-3
b) y=3x-4/7
c) y=-1/3x+4/7
d) y=1/3x-4/7