ECZ 2015 · O-Level Paper 1 — Trigonometry
The diagram shows a right angled triangle in which angle ACB = 90°, AB = 15 cm and AC = 12 cm. Find the length of BC.
- A. 9 cm
- B. 19.2 cm
- C. 3 cm
- D. 81 cm
Verified working — step 1
By Pythagoras, BC² = AB² − AC² = 15² − 12² = 225 − 144 = 81, so BC = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question