Premium Cosine Rule | Maths Codebreaker | Answers Included

PREMIUM RESOURCE - available to purchase; this is not a free download.

Use the cosine rule to find missing sides and angles in non-right triangles.

This Premium paid resource contains one complete A4 pupil worksheet with 20 questions and a matching answer page with workings, plus a product-family guide. Pupils solve the maths, match answers to letters in the code grid and decode the hidden words.

Difficulty: Level 10 of 10 within this range (1 is easiest; 10 is most demanding). These levels are a guide to relative challenge, not GCSE grades.

Three questions from this worksheet:
1. Two triangle sides are 3 and 12 cm; included angle 110°. Find x in centimetres, to 1 decimal place.
2. Triangle sides: 15, 12 and 4 cm. Angle x is opposite the 4 cm side. Find angle x in degrees, to 1 decimal place.
3. Two triangle sides are 8 and 10 cm; included angle 120°. Find x in centimetres, to 1 decimal place.

Use for focused practice, consolidation, homework or a lesson activity after teaching the method. Print the pupil page for learners and retain the answer page for checking. Follow the rounding and unit instructions on the sheet.

This resource belongs to a completed 100-topic Maths Codebreakers range. Halloween codebreaker resources are also available. A mixed-topic revision codebreaker range is coming soon. These other ranges are separate resources and are not included in this download.