Can you name these types of angles?

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Presentation transcript:

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

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

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

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

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

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

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?

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?

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!

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

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

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

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