1. 1-4: Angle Measure

2. Definitions ray – a part of a line
angle – rays that share an endpoint.
vertex – the common endpoint

3. How to name an angle: With numbers. With one letter. With 3 letters
Necessary when different angles have the same endpoint.
The vertex is always the middle letter.

4. Name each numbered angle using letters.

5. Types of angles: right angle – 90 degrees
acute angle – less than 90 degrees
obtuse angle – greater than 90 degrees
How big is a degree anyway?

6. Other definitions:
bisect – when a ray bisects an angle, it cuts it into two equal parts.
congruent – having the exact same measure.
opposite rays – two rays that form a line (180 degree angle)

7. Ray BC bisects <ABD. If m<ABC=3x+1 and m<CBD=7x+33.
Find x.
Find m<ABC.
Find m<ABD.

8. Assignment
p. 34; (odd), (all)