- Angles, Lines, and Polygons
- Home
- Measuring an angle with the protractor
- Acute, obtuse, and right angles
- Naming segments, rays, and lines
- Identifying parallel and perpendicular lines
- Acute, obtuse, and right triangles
- Classifying scalene, isosceles, and equilateral triangles by side lengths or angles
- Finding an angle measure of a triangle given two angles
- Naming polygons
- Drawing and identifying a polygon in the coordinate plane

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

**Point** − A basic geometric entity. It that has no length, width or height. It is described only by its position.

This is a point Q

**Straight line** − A set of points that extend indefinitely in both directions.

This is an example of line UT.

A line is a continuous set of points that continues on indefinitely. The arrow indicates infinite length.

**Line segment** − A part of a line with two end points say X and Y.

This is an example of line segment XY.

**Ray** − A part of a line with one endpoint. A ray extends indefinitely in one direction.

This is an example of ray DT.

Identify given figure as a line segment, a ray or a line. Then name the figure using the given points.

**Step 1:**

The given figure has one end point and continues indefinitely in one direction. Therefore, it is a ray.

**Step 2:**

The ray is named as FG.

Identify given figure as a line segment, a ray or a line. Then name the figure using the given points.

**Step 1:**

The given figure continues indefinitely in both directions. So it is a line.

**Step 2:**

The line is named as CD.

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