An angle consists of two rays that share a common vertex point. The angle is denoted by the vertex point followed by the labels of the rays that form the angle. In a figure, angle PQS, angle SQP, angle SQR, and angle RQS are examples of angles formed by the intersection of rays. The measure of an angle is represented by mA, and angles with the same measure are called congruent. Next class will cover angle measurement postulates and angle types such as acute, right, obtuse, straight, and adjacent angles.

1. 1.4 vocabulary and postulates

2. An angle consists of two different rays that
have the same initial point.
The rays are the sides of the angles.
The initial point is the vertex of the angle.
The angle that has sides AB and
AC is denoted by BAC, C
CAB, or A. The point A is
the vertex of the angle.
A B

3. Name the angles in the figure
PQS or SQP
SQR or RQS
PQRor RQP
P
S
Q
R

4. The measureof A is denoted by m A.
Angles that have the same measure
are called congruent angles.

5. Next class we will look at the Protractor
Postulate, the Angle Addition
Postulate, interior and exterior
angles, acute, right, obtuse, straight and
adjacent angles.
Have a great weekend!