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Quarter circle
The arc is one quarter of a circle so is 2pir, the other components of the quarter circle are the two radii, so perimeter is 2r+2pir = 2r(1+pi)
A quarter of a circle, formed by two radii forming a right angle at the centre, is called a quadrant.
A quarter circle has one axis of symmetry. An axis of symmetry is a line that divides a shape into two equal halves that are mirror images of each other. In the case of a quarter circle, if you draw a line through the center of the circle perpendicular to the diameter, it will divide the quarter circle into two equal parts that are mirror images of each other.
a quadrant