Geometry

What is Angle Measurement? Define what a measure of an angle is Use a protractor properly Construct angles given specific angle measurements Recognize and interpret geometric markings

Define congruent segments and congruent angles Label congruent figures/segments/angles accordingly

State a rule on angles in relation to playing pool

Draw an angle of any size using your straightedge and label it Angle JON.

JJ

OONN

Bring out your protractors and measure the angle. How?

Step 1. Align the center of the protractor with the vertex of the angle.

JJ

OONN

Step 2. Make sure that one side of the angle coincides with the zero line of the protractor still making sure that the vertex of the angle is at the center. JJ

OONN

Step 3: Read the measure of the angle where the other side of the angle crosses the protractor scale.

JJ

OONN

Note: Use the scale that coincides with the O: Use the scale that coincides with the O’’ of the other ray. of the other ray.

Independent of the length of the sides of the angle

Defined as, “the smallest amount of rotation necessary from the overlapping position of the two rays to the final angle.”

degrees as unit of measurement

Two figures that have the exact size and shape are said to be CONGRUENTCONGRUENT.

Two segments are said to be congruent if and only if they have the same measure.

Two angles are said to be congruent if and only if they have the same measure.

CmBm

CB

ACAB

ACAB

A

B C