Line segment : A line segment has two end points with a definite length. Ray : A ray has one end point and infinitely extends in one direction. Straight line : A straight line has neither starting nor end point and is of infinite length. Acute angle : The angle that is between 0° and 90° is an acute angle, ∠A in the figure below. Obtuse angle : The angle that is between 90° and 180° is an obtuse angle, ∠B as shown below. Right angle : The angle that is 90° is a Right angle, ∠C as shown below. Straight angle : The angle that is 180° is a straight angle, ∠AOB in the figure below. Supplementary angles : In the figure above, ∠AOC + ∠COB = ∠AOB = 180° If the sum of two angles is 180° then the angles are called supplementary angles. Two right angles always supplement each other. The pair of adjacent angles whose sum is a straight angle is called a linear pair. Complementary angles : ∠COA + ∠AOB = 90° If the sum of two angles is 90° then the two angles are ...
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