book Maths Puzzle Numerical Ability

What is the equation of a circle with center (0,1) and a radius 2 units?

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book Other Question

a certain rectangle has lengths that are twice its width. the perimeter of this rectangle is 72 centimeters. this rectangle actually represents a drawing of the size of a planned v I have points A (5,7) and B (-2, 3).
What is the equation to the line connecting these points?
What is the distance between these two points?
What is their mid-point?
What is