Chapter 17

Chapter Objective:

* Angles and lines can be found all around us. These can be described with special names.

Vocabulary:

point - An exact location in space.

line - A line is a straight path. It goes on without end, in both directions.

endpoint - The endpoint is the end of the line segment.

line segment - A line segment is a part of a line. It has two endpoints.

angle - When two line segments share the same endpoint, they form an angle. Angles can be acute (less that 90°), or obtuse (greater than 90°), or right angles (exactly 90°), or straight angles (exactly 180°), to name a few.

right angle - A right angle measures 90 degrees (90°) exactly. It looks like the letter "L".

greater than - When a value is greater than, it means having a larger value; more. The symbol for greater than is ›.

less than - When a value is less than, it means having a smaller value. The symbol for less than is <.