rectangle - a plane figure with four right angles, quadrilateral - a polygon with four edges (sides) and fourcorners, polygon - a figure with many sides and angles, usually more than four, hexagon - six-sided polygon, heptagon - a plane figure with seven straight sides and angles, pentagon - a plane figure with five straight sides and five angles, ellipse - a shape like a circle but wider in one direction than the other, circle - round, plane figure; it is the set of all points in a plane that are at a given distance from the centre , parallelogram - a four-sided plane rectilinear figure with opposite sides parallel, rhombus - a quadrilateral whose four sides all have the same length, trapezium - a quadrilateral with one pair of sides parallel, octagon - a plane figure with eight straight sides and angles, deltoid - quadrilateral with two distinct pairs of congruent adjacent sides, equilateral triangle - a triangle in which all three sides are equal , isosceles triangle - a triangle which hastwo sides of equal length, scalene triangle - a triangle which has no sides and no angles equal, obtuse angle - an angle whose measure is between 90° and 180°, acute angle - an angle whose measure is between 0° and 90°, right angle - an angle of 90°,

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