6.+Measuring+Angles

=Measuring Angles= Objective: To find the measures of angles and identify special angle pairs.

Standards
Visit Standards page to identify numbers. NCTM Standards: 1, 2, 3, 4, 7 CT Mathematics Standards: 1.3(a), 2.1, 2.2, 3.1, 3.2, 3.3

An //angle// is formed by two rays with the same endpoint. The rays are the //sides// or //legs// of the angle, and the endpoint is the //vertex.//

This angle may be named <ABC or <CBA, as long as the vertex is in the middle. Since there is only one angle, it may also be called <B.

Why can't this angle be called <B?

Edit this wiki with your reasons here.

Let's have some fun learning about angle measurement. Play this game: [].

Think you can estimate angles pretty well? Try this game: [].

Angles can be classified as //acute, right, obtuse,// or //straight.// Read about them at []. Make sure to do the examples at the bottom.

Quick check - put your answers under the discussion tab : []

// Congruent Angles // are angles that have the same measure. //Vertical angles// are always congruent.

If point D is in the interior of <ABC, then m<ABC = m<ABD+m<DBC. Let's investigate this postulate with the following activity: []
 * Angle Addition Postulate **

Two angles that add up to 90 degrees are called //complementary.// If they add up to 180 degrees, then they are //supplementary.//

Solve for the unknown angle: []

Using what you know about angles and algebra, solve for the given variable: []