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Great description on what points, lines, and angles are.

A helpful scientific calculator that runs in your web browser window.

Similar triangles - all three corresponding angles the same. AAA

A quick way to test your knowledge of angle types

Discussion of the way angles are measured in degrees, minutes, seconds.

Coplanar objects are those lying in the same plane

Definition and properties of adjacent angles - those that share a common leg or ray

Definition of an angle.

This website is a worksheet to estimate and measure angles. The answer sheet is there also.

Explanation and examples of angles along a straight line.

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