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Geometry: Angles in a Triangle

This worksheet is about calculating the third angle in a triangle.

'Geometry: Angles in a Triangle' worksheet

Key stage:  KS 2

Curriculum topic:  Geometry: Properties of Shapes

Curriculum subtopic:  Identify Angles at a Point

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

 

Remember  

The angles in any triangle add to 180°

So the missing angle = 180° - 54° - 64° = 62°

Two of the angles in a triangle are 77º and  66º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 75º and  65º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 68º and  67º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 25º and  42º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 25º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 130º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 101º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 131º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 97º and  36º.

Work out the size of the third angle in degrees.

 

(Just write the number)

Two of the angles in a triangle are 170º and  .

Work out the size of the third angle in degrees.

 

(Just write the number)

  • Question 1

Two of the angles in a triangle are 77º and  66º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
37
EDDIE SAYS
180 - 77 - 66
  • Question 2

Two of the angles in a triangle are 75º and  65º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
40
EDDIE SAYS
180 - 75 - 65
  • Question 3

Two of the angles in a triangle are 68º and  67º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
45
EDDIE SAYS
180 - 68 - 67
  • Question 4

Two of the angles in a triangle are 25º and  42º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
113
  • Question 5

Two of the angles in a triangle are 25º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
130
  • Question 6

Two of the angles in a triangle are 130º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
25
  • Question 7

Two of the angles in a triangle are 101º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
54
  • Question 8

Two of the angles in a triangle are 131º and  25º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
24
  • Question 9

Two of the angles in a triangle are 97º and  36º.

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
47
  • Question 10

Two of the angles in a triangle are 170º and  .

Work out the size of the third angle in degrees.

 

(Just write the number)

CORRECT ANSWER
1
---- OR ----

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