Angles

Angles

By Patsy McCaffrey

​You need to recognise different angles

​Right Angle

Acute Angle

Obtuse Angle

Reflex Angle

​Angle Rules you need to Learn

​80 + 60 = 140

180 - 140 = 40
a= 40

​120 + 95 + 55 = 270

360 - 270 = 90

a = 90

​30 + 80 = 110

180 - 110 = 70
a = 70

​a = 70

70 + 70 = 140

180 - 140 = 40

b = 40

​130 + 150 = 280

360 - 280 = 80

a = 80

​Misconception

​j = 40
because
180 - 140 = 40
Angles on a straight line add up to 180

​180 - 140 = 40
a = 40
Reason: Angles on a straight line add up to 180

40 + 59 = 99
180 - 99 = 81
j = 81
Reason: Angles in a triangle add up to 180

​Your turn
Please read the question fully
and use a calculator

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Multiple Choice

Find the missing angle.

• 53

• 67

• 77

• 43

Multiple Choice

Find the missing angle.

• 28

• 32

• 60

• 38

Multiple Choice

What is the value of "a"?

• 75°
• 65°
• 55°
• 85°

Multiple Choice

What is the value of "a"?

• 45
• 55
• 35
• 65

Multiple Choice

What is the value of the missing angle?

• 61
• 50
• 60
• 69

Multiple Choice

• 61
• 153
• 27
• 146

Multiple Choice

What is the measure of angle b?

• 36^o
• 56^o
• 63^o
• 117^o

Multiple Choice

What is the name of this kind of triangle?

• Right

• Scalene

• Isosceles

• Equilateral

Multiple Choice

Work out the size of the missing angle

• 55

• 65

• 115

• 125

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Multiple Choice

Work out the size of the missing angle

• 58

• 62

• 68

• 118

Multiple Choice

Work out the size of the missing angle

• 34

• 134

• 96

• 146

Multiple Choice

Work out the size of the missing angle

• 155

• 205

• 25

• 45

Multiple Choice

Work out the size of the missing angle

• 136

• 64

• 44

• 144

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