Lines and Angles

Answer

A line segment is a part of a line with two endpoints (like AB). A ray is a part of a line with one endpoint that extends infinitely in one direction (like AB with arrow). A line extends infinitely in

Answer

Collinear points are three or more points that lie on the same straight line (like points A, B, C on line l). Non-collinear points are points that do not lie on the same straight line (like points for

Answer

1) Acute angle: 0° < angle < 90° 2) Right angle: angle = 90° 3) Obtuse angle: 90° < angle < 180° 4) Straight angle: angle = 180° 5) Reflex angle: 180° < angle < 360°

Answer

Complementary angles: Two angles whose sum is 90°. Example: 30° and 60° are complementary. Supplementary angles: Two angles whose sum is 180°. Example: 120° and 60° are supplementary. Note: Angles d

Answer

Adjacent angles are two angles that: 1) Have a common vertex 2) Have a common arm (ray) 3) Their non-common arms are on different sides of the common arm When two angles are adjacent, their sum equal

Answer

A linear pair of angles are adjacent angles whose non-common arms form a straight line. This means: 1) They are adjacent angles 2) Their non-common arms are opposite rays 3) Their sum is always 180°

Answer

Vertically opposite angles are formed when two lines intersect. They are the angles that are opposite to each other at the intersection point. Key property: Vertically opposite angles are always equa

Answer

Axiom 6.1: If a ray stands on a line, then the sum of the two adjacent angles so formed is 180°. Axiom 6.2: If the sum of two adjacent angles is 180°, then the non-common arms of the angles form a li