angle, An ____ is a measure of turn, measured in degrees. It is formed by two rays that share a common endpoint., vertex, The common endpoint of an angle is called a ________., ray, A _____ is the name given to a line/side of an angle., Perpendicular, _______ lines meet at 90° to form a right angle., straight line, Angles at a point on a _____ _____ add up to 180°., protractor, A _________ is used to measure angles, typically in the form of a flat semi-circle marked with degrees along the curved edge., right angle, There are 90° in a right angle., degree, A _______ is a unit of measurement that measures the magnitude of an angle. The symbol for a degree is °. A complete circle rotates at 360°., acute, An ____ angle is less than 90°., obtuse, An _____ angle is more than 90° but less than 180°., reflex, A ______ angle is more than 180° but less than 360°., Corresponding, _______ angles formed by parallel lines are equal and form a sort of 'F'-shape., Parallel lines, _____ _____ are the distance apart everywhere along their length., interior, The _____ angles of a polygon are the angles inside each corner., Supplementary, _______ angles add up to 180°., exterior, The ____ angle of a polygon is the angle between a side and a line that extends out from one of .neighbouring sides, Congruent, _______ shapes are exactly equal in size and shape: equal sides and equal angles., Similar, _______ shapes are the same shape but different in size. Their angles are equal in size., alternate, When a straight lines crosses two parallel lines, it forms two pairs of _________ angles (in a sort of Z-shape); _______ angles are equal., Full turn, There are 360° in a full turn., vertically opposite, When two straight lines intersect, two pairs of ______ _____ angles are formed; _________ _______ angles are equal., allied, When a straight line crosses two parallel limes to make a kind of 'C'-shape, the interior angles are known as _______ angles and add up to 180°., polygon, A ________ is a shape whose sides are all straight., sum, The sum of the exterior angles of any polygon is 360°., Complementary, _______ angles add up to 90°.

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