Acute angle - an angle that measures less than 90°, Angle - two rays with a common endpoint (the vertex), Complementary angles - two angles whose degree measures have a sum of 90°, Congruent angles - angles whose angle measurements are equal, Degree - the unit used to measure the size of an angle, Obtuse angle - an angle that measures greater than 90° but less than 180°, Protractor - a tool used to determine the measure of an angle, Ray - part of a line that begins at one endpoint and continues without end in one direction, Right angle - an angle (formed by perpendicular lines) that measures exactly 90°, Straight angle - an angle that measures 180° (a straight line), Supplementary angles - two angles whose degree measures have a sum of 180°,

4th Grade Angles

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