is a shape that is made up of a curved line. It's round, and all points on the curved line are an equal distance from the center point, is a shape with four equal sides and four corners that are all right angles (90 degrees), is part of a circle bounded by a diameter and half of the circumference, is a shape formed when three straight lines meet. It has three sides and three corners (angles), is a shape with four sides and four corners. The corners are all right angles. It follows that the pairs of sides opposite each other must be parallel and of the same length,

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