1 6 1 7 angles and their measures n.
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1.6-1.7 Angles and Their Measures. Geometry. Objectives : Use angle postulates Classify angles as acute, right, obtuse, or straight. Using Angle Postulates.

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  • Use angle postulates
  • Classify angles as acute, right, obtuse, or straight.
using angle postulates
Using Angle Postulates
  • An angle consists of two different rays that have the same initial point. The rays are the sides of the angle. The initial point is the vertex of the angle.
  • The angle that has sides AB and AC is denoted by BAC, CAB, A. The point A is the vertex of the angle.
ex 1 naming angles
Ex.1: Naming Angles
  • Name the angles in the figure:


There are three different angles.

  • PQS or SQP
  • SQR or RQS
  • PQR or RQP

You should not name any of these angles as Q because all three angles have Q as their vertex. The name Q would not distinguish one angle from the others.

more . . .
  • Angles that have the same measure are called congruent angles.


note geometry doesn t use equal signs like algebra
Note – Geometry doesn’t use equal signs like Algebra


mBAC = mDEF



“is congruent to”

“is equal to”

Note that there is an m in front when you say equal to; whereas the congruency symbol  ; you would say congruent to. (no m’s in front of the angle symbols).

interior exterior
  • A point is in the interior of an angle if it is between points that lie on each side of the angle.
  • A point is in the exterior of an angle if it is not on the angle or in its interior.
postulate 4 angle addition postulate
Postulate 4: Angle Addition Postulate
  • If P is in the interior of RST, then

mRSP + mPST = mRST

classifying angles
Classifying Angles
  • All angles are classified as acute, right, obtuse, and straight, according to their measures.