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Trigonometry - finding angles Now have a go yourself . . . Work out the side of angle x How to . . . x 18 cm 11 cm 13 cm 9 cm x x *The diagram shows a ladder leaning against a vertical wall. The ladder stands on horizontal ground. 5 cm 15.8 cm The length of the ladder is 6 m. The bottom of the ladder is 2.25 m from the bottom of the wall. 17 cm x A ladder is safe to use when the angle marked y is about 14 cm 75o. Is the ladder safe? You must show all your working. 14 cm x x 13.8 cm 20 cm 18.3 cm 6.2 cm (3) x NOT DRAWN TO SCALE www.justmaths.co.uk 9.7 cm ©JustMaths 2013 Ready to be marked ? Exam Questions (a) Here is a right angled triangle. Calculate the size of the angle marked x, giving your answer correct to 1 decimal place. Checklist Correct ratio used (sin/cos/tan) Working out shown Keywords 8 cm x 5 cm Things to remember ... (b) Here is another right angled triangle. Calculate the value of y. Give your answer correct to 1 decimal place What went well ... y cm o 40 Teacher comment .. 12.5 cm (4)