square, a four-sided regular polygon which is also known as a quadrilateral with four equal sides. It has four equal angles that measure 90° each., triangle, a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices, parallelogram, a 2D shape with two matching pairs of opposite sides that are parallel and equal in length, quadrilateral, this has four-sides, it is 2-dimensional (a flat shape), closed (the lines join up), and has straight sides, radius, the distance from the centre of a circle to the outer edge of a circle, area, the amount of space within the perimeter of a 2D shape. It is measured in square units, such as cm² and m², perimeter, the total measurement of all the edges of a shape, rectangle, a four sided polygon and all the angles are equal to 90 degrees, trapezium, this is type of a quadrilateral and a 2D shape. One pair of opposite sides is parallel., compound shape, a shape made up of two or more geometric shapes, polygon, a two-dimensional closed figure that has three or more straight sides. Any figure with straight edges, such as a triangle or rectangle, is a polygon

geometry definitions

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