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Cila Primary School

Ysgol Gynradd Cila

Maths & Numeracy

21st January 2022

Calculating missing angles

This week we have been calculating missing angles in triangles, on a straight line and at a point. 

We used the following success criteria to help: 

  • Angles in a triangle add up to 180 degrees
  • Angles on a straight line add up to 180 degrees
  • Angles at a point ad up to 360 degrees 
  • Vertically opposite angles are equal

Click on the link below to try some of the activities in the missing angles game


This week we have revising types of angles, measuring angles and drawing angles. 

Click on the link below to access the games on our class resources page to practise at home! 


Next week we will be calculating missing angles using basic algebra. 



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