**Equations and Turn**

Starter

Write down the relationship between the angles shown in these pictures.

Equations and turn

Example

**L.O. - Form equations using angle properties.**

Starter

Write down the relationship between the angles shown in these pictures.

Add to 360

Add to 180

Add to 180

Angles are equal

o

o

o

x + 20

3x + 20

3x - 20

x + 20

Find the values of the angles in these diagrams.

Example

x + 20

3x + 20

3x - 20

x + 20

Find the values of the angles in these diagrams.

Find the value of y in this triangle.

Equations and turn

Find the value of y in this triangle.

3x - 2 = x + 38

3x = x + 40

2x = 40

x = 20

3x - 2 = 58

x + 38 = 58

180 - 58 - 58 = 64 = y

o

3x + 20 + x + 20 = 180

4x + 40 = 180

4x = 140

x = 35

3x + 20 = 125,

x + 20 = 55

3x - 20 = x + 20

3x = x + 40

2x = 40

x = 20

3x - 20 = 40,

x + 20 = 40

Activity

Complete the forming equation sheet

Activity

Complete the forming equation sheet

(i) x = 40

(ii) x = 90

(iii) x = 30

(iv) x = 30

(v) x = 18

(vi) x = 30

(vii) x = 20

(viii) x = 30

(ix) x = 75

(x) x = 20

(xi) x = 32.5

(xii) x = 25

Plenary

Plenary

a = 32

2a - 6 = 58

n = 30

n+50=80

2n+25=85

3n+20=110

4n-35=85

a=13

4a+44=96

5a-23=42

2a+16=42

n=25

4n+10=110

2n+20=70

5n-15=110

3n-5=70

**Activities**

**Activity**

Answers

Answers

**Key**

Examples

Examples

**Worked**

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Example

**Worked**

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