FREE Triangle Area Using Sine | Maths Codebreaker | Answers Included

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Calculate triangle areas using two sides and their included angle.

This FREE resource contains one complete A4 pupil worksheet with 22 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 7 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 8 and 11 cm; included angle 75°. Find the triangle’s area in cm^2, to 1 decimal place
2. Two triangle sides are 15 and 4 cm; included angle 75°. Find the triangle’s area in cm^2, to 1 decimal place
3. Two triangle sides are 6 and 9 cm; included angle 45°. Find the triangle’s area in cm^2, 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.