1. Can you name these types of angles?
Starter
Can you name these types of angles?
90°
Right angle
Acute
Obtuse
Reflex

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

3. Angles on a straight lineb a
Angles on a straight line add up to 180o
Angles a + b = 180o

4. Angles in a triangle add up to 180ob a c b a c
Angles in a triangle add up to 180o
Angles a + b + c = 180o

5. Vertically opposite anglesb d c
Vertically opposite angles are equal
Angle a = c and b = d

7. Plenary
Compose a text to an absent friend (160 characters) telling them all they need to know about today’s lesson.

8. Starter Can you calculate all the missing angles? 44° 44° e a b c d f
59°
Extension: Can you give reasons for your answers?

9. Starter Can you calculate all the missing angles?
44°
44°
44° e a
68° b
68° c
68°
68° d
31° f
59°
Extension: Can you give reasons for your answers?

10. Measure both angles in each diagram and write down your observations.
Work in pairs.
Measure both angles in each diagram and write down your observations.
Check that you have measured accurately!

11. Alternate angles are equalb d c
Alternate angles are equal
Angle a = c and b = d
They make a Z shape

12. Corresponding angles are equalb a d c
Corresponding angles are equal
Angle a = c and b = d
They make an F shape

13. Supplementary angles add up to 180°b a
Supplementary angles add up to 180°
Angle a + b = 180°
They make a C shape

14. Answers x = 48° Alt z = 42° Sup y = 61° Cor
x = 54° Sup x = 96° Cor y = 133° Alt
y = 120° Sup z = 58° Line, Alt z = 99° Sup
x = 54° Sup x = 96° Cor y = 133° Alt
y = 120° Sup z = 58° Line, Alt z = 99° Sup
x = 87º Alt a = 54º Line, Alt n = 54º Cor
y = 109º Quad b = 116º Line, Alt m = 58º Tri