1. This diagram helps explains why angles at a point add to 360o.90
Vertical
Horizontal
Remember: Angles at a on a line add to 180o 90 90
This diagram helps explains why angles at a point add to 360o.

2. This explains why angles at a point add to 360o.90
Vertical
Horizontal 1 2
360o
360o
360o 3 4
This explains why angles at a point add to 360o.
360o
360o

3. Angles at a point add to 360ob c d
Angles at a point add to 360o
Angle a + b + c + d = 3600

4. Angles at a Point Example 1: Find angle a. a 75o 85o 360o 80o +90
360o
75o
85o
80o a
Example 1: Find angle a. 85 75 80 +
240
Angle a = ( )
= = 120o

5. Angles at a Point Example 2: Find angle x. 105o x 360o 100o +90
360o 90
100
105 +
295
Angle x = ( )
= = 65o

6. 1
360o in a circle.
What does it mean?
90o
360o 4 2
270o 3
180o