## Angles In The Roof (2)

 Difficulty: Rating: GCSE Marks:

GCSE Text:
The design of the roof beams in a new building is shown in this diagram:

Using your knowledge of angle rules:

a) Calculate the size of angle a

b) Calculate the size of angle b

c) Calculate the size of angle c

Suggestions:
This video was made when a school building was being constructed on site. KIER Construction kindly allowed a number of videos to be made so that students could grasp the use of Maths in the construction industry. Students very much enjoy seeing a professional (other than a teacher) talk about design, specification and mathematics, and it is a firm favourite. It takes many students over 5 minutes to spot the important elements of the design, and as such is a valuable class resource.  A similar video exists with more basic angle calculations.

Extension Ideas:
Teachers could extend the learning by considering:

• Adding extra angles to find – a ‘d’ placed above and to the left of angle b works well to stretch students.