Perpendicular - Lines that meet at a right angles to each other, Scalene - Triangle with no sides or angles equal.nt, Obtuse - Angle above 90 degrees, below 180 degrees, Acute - Angle below 90 degrees, Reflex - Angle above 180 degrees, less than 360, Equilateral - Triangle with all sides equal length and all angles equal size., Isosceles - Triangle with two sides equal and two sides equal length, Angle - Measurement of a turn, Triangle - Three-sided shape, Degrees - Angles are measured in these units, Parallel - These lines are always the same distance apart, Polygon - Closed 2 D shapes with straight sides, Circumference - The perimeter of a circle, Diameter - Distance from one point on the perimeterof a circle, through the centre to another point on the perimeter of a circle, Radius - The distance from the centre to the perimeter of a circle, Quadrilateral - A 2 D shape with 4 straight sides,

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