LINES AND ANGLES

 

•       LINES -   a straight one- dimensional figure that has no thickness and extends endlessly in both directions.

•       ANGLES - An angle is a combination of two rays (half-lines) with a common endpoint. The later is known as the vertex of the angle and the rays as the sides, sometimes as the legs and sometimes the arms of the angle.

•       ACUTE ANGLE -Acute angles measure less than 90 degrees

•       RIGHT ANGLE - a right angle is an angle of exactly 90 degrees

•       OBTUSE ANGLE - an angle between 90° and 180°

•       REFLEX ANGLE- any angle that is more than 180 degrees (half circle) and less than 360 degrees

•       STRAIGHT ANGLE - a straight angle is an angle equal to 180 degrees

•       LINE – SEGMENT -  a line segment is a part of a line that is bounded by two distinct end points

             COLLINEAR POINT - Three or more points that lie on the same line are collinear points

•             ADJACENT ANGLE - two angles having the same vertex