Objective

1
Objective

• Be able to use angle facts to solve problems in
  geometry.

2
FACT A

• Angles around a point add up to 360º

3
FACT B

• Angles on a straight line add up to 180º

4
FACT C

• Angles in a triangle add up to 180º

a
c
a b c 180º
b
5
FACT D

• The base angles in an isosceles triangle are
  equal.

6
FACT E

• Each angle in an equilateral triangle is 60º

7
FACT F

• Vertically opposite angles are equal.

b
a
a
b
8
FACT G

• Alternate angles are equal

a
a
9
FACT G

• Corresponding Angles are equal

b
b
10
FACT H

• Allied angles add up to 180º.

y
x
x y 180º
11
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