Geometry CP



Geometry CP Name:

Outline Sec. 1-4 Date:

Mrs. Sweet

Measuring Angles

Solve It: Which angles do you think are the same size?

How can you verify your answer?

An angle is the union of two that have the same endpoint.

The is the common endpoint.

The rays are called the of the angle.

An angle can be formed by , but they should still be considered parts of rays.

Symbol for angle:

Naming angles:

When there is only angle at a given vertex the angle can be named by the vertex.

When there are several angles with the same vertex the angle is named by a point from each with

the vertex point in the of the name.

[pic]can be named or

[pic]can be named or

The of an angle is the amount

of openness of the of the angle.

The “measure of an angle 1” is written as:

An angle is measured in

The of an angle is the region that contains all points between the two rays.

The of an angle is the region containing all the points outside of the angle.

Postulate 1-7: Protractor Postulate: Consider [pic]and a point A on one side of [pic]. Every ray of the form [pic]can be paired with a real number from 0 to 180.

Measuring an angle with a protractor:

Angles are measured in

An entire circle measures

Measuring an angle refers to the , not the exterior angle, unless specified.

An angle has a unique measure from to

Types of Angles:

[pic]

Examples:

What are the measures of ................
................

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