### Understanding Elementary Shapes Summary

### Lines and Angles

**Length of a line segment:**

The distance between the endpoints of a line segment is the length of the line segment. The length of a line segment can be measured accurately using a ruler and a divider.

**Complete angle:**

One quadrant = 1 4 (complete angle) = 1 4 x 360° = 90°

Two quadrants = 1 2 (complete angle) = 1 2 x 360° = 180°

Three quadrants = 3 4 (complete angle) = 3 4 x 360° = 270°

**Right angle:**

An angle that measures 90° is called a right angle. A right angle makes a quarter revolution.

**Straight angle:**

An angle that measures 180° is called a straight angle. A straight angle makes a half revolution.

**Acute angle:**

An angle that measures less than 90° is called an acute angle.

**Obtuse angle:**

An angle that measures more than 90° and less than 180° is called an obtuse angle.

**Reflex angle:**

An angle that measures more than 180° is called a reflex angle.

**Intersecting lines:**

Two lines that meet each other at a single point are called intersecting lines.

**Perpendicular lines:**

Two lines that intersect each other at right angles are said to be perpendicular to each other.

**Bisector of a line segment:**

A bisector of a line segment is a line that divides the line segment into two equal parts.

**Perpendicular bisector of a line segment:**

The perpendicular line that divides a line segment into two equal parts is called the perpendicular bisector of the line segment.

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