# Triangles: Calculate Unknown Angles

In this worksheet, students use their knowledge of the properties of a triangle to evaluate unknown angles.

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Triangles, Quadrilaterals and Polygons

Difficulty level:

### QUESTION 1 of 10

In this worksheet, we will learn how to calculate the unknown angle in a triangle

Question:

Calculate the unknown angle in the triangle

Angle = 180° - 54° - 64° = 62°

Calculate the unknown angle

Calculate the unknown angle

Calculate the unknown angle

Calculate the unknown angle

Calculate the unknown angle

Calculate the unknown angle

Calculate the unknown angle

• Question 1

Calculate the unknown angle

37
EDDIE SAYS
180 - 77 - 66 = 37
• Question 2

Calculate the unknown angle

32
EDDIE SAYS
180 - 69 - 79 = 32
• Question 3

Calculate the unknown angle

41
EDDIE SAYS
180 - 87 - 52 = 41
• Question 4

Calculate the unknown angle

39
EDDIE SAYS
180 - 74 - 67 = 39
• Question 5

Calculate the unknown angle

74
EDDIE SAYS
180 - 22 - 84 = 74
• Question 6

Calculate the unknown angle

64
EDDIE SAYS
180 - 90 - 26 = 64
• Question 7

Calculate the unknown angle

25
EDDIE SAYS
180 - 86 - 69 = 25
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