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 b c a + b + c = 180º

5. FACT D The base angles in an isosceles triangle are equal.

6. FACT E Each angle in an equilateral triangle is 60º 60º

7. FACT F Vertically opposite angles are equal. aa b 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. x y x + y = 180º