1. ©2009 G Dear – Not to be sold/Free to use
Stage 4
Years 7 & 8
Angles
Angles at
a Point.
Web
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©2009 G Dear – Not to be sold/Free to use

2. Angles at a point which form a revolution
add to 360o. ao bo co
ao + bo + co
= 360o
End of
Slide

3. Angles at a point which form a revolution
add to 360o.
140o
70o
70o + 140o + 150o
150o
= 360o
End of
Slide

4. Angles at a point which form a revolution
add to 360o.
120o
120o
120o + 120o + 120o
120o
= 360o
End of
Slide

5. Angles at a point which form a revolution
add to 360o.
120o
90o
120o + 50o
+ 90o +100o
100o
= 360o
End of
Slide

6. Angles at a Point (5/6) ao + 85o + 95o +130o = 360o ao + 310o = 360o
Example 1: Find the value of the pronumeral.
130o
85o
95o ao
ao + 85o + 95o +130o = 360o
ao + 310o = 360o
ao = 50o
Reason: Angles at Point
End of
Slide

7. Angles at a Point (6/6) bo + 65o + 95o +80o = 360o bo + 240o = 360o bo
Example 2: Find the value of the pronumeral.
80o
65o
95o bo
bo + 65o + 95o +80o = 360o
bo + 240o = 360o
bo = 120o
Reason: Angles at Point
End of
Show