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All About Angles



This page talks about the four types of angles: straight, right, obtuse, and acute. It also talks about measuring angles with a protractor and distinguishing between triangles based on the three types of angles.

The four types of angles:


Straight angle: An angle that makes a straight line and measures exactly 180 degrees.

Right angle: An angle that measures exactly 90 degrees and is usually indicated with a "right angle box".

Acute angle: An angle that measures less than 90 degrees.

Obtuse angle: An angle that measures greater than 90 degrees.

Straight Angle:

Picture

Acute Angle:

Picture

Right Angle:

Picture

Obtuse Angle:

Picture

Three types of triangles:


Right Triangle: Has one right angle in it

Acute Triangle: Has all acute angles in it

Obtuse Triangle: Has one obtuse angle in it


Right Triangle:

Picture

Acute Triangle:

Picture

Obtuse Triangle:

Picture

Practice Problems:

Angles:

angles.pdf
File Size: 71 kb
File Type: pdf
Download File

Reading Protractors:

protractor1.pdf
File Size: 245 kb
File Type: pdf
Download File

protractor2.pdf
File Size: 266 kb
File Type: pdf
Download File

Classifying Triangles:

classifyingtrianges.doc
File Size: 1764 kb
File Type: doc
Download File

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