book Maths Puzzle Numerical Ability

the measure of the complement of an angle is 20 degrees less than the measure of the angle.Find the number of degrees in the angle.

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Question; Decide whether of not the equations has a circle as its graph. If it does, give the center and the radius. #20. x^2-12x+y^2+20=0 Thank you so much for your help. Angela A circular pond has a diameter of 2.5 meters. The owner wants to put a concrete walkway around the pool that has uniform width. She has enough to cover 5m(squared). What is the maximum width her walkway can be?