Using trigonometry to find the area of any triangle no prep lesson. Power point with proof of formula and 3 examples. Each example has one for teacher to do and then one for students to try, Worksheet ...

Looking for more revision? There are videos, diagrams and more on calculating the area of a triangle using trigonometry in this National 5 Maths guide. National 5 Maths - Calculating the area of a ...

Looking for a rigorous, no-prep resource pack to help your secondary students master non-right-angled triangles? This comprehensive 21-page maths bundle combines three scaffolded practice packets ...

Being able to identify which formula to use, sine or cosine, and when, is necessary to answer questions on this topic successfully. Check you are confident in how to use the sine and cosine rules.