ECZ 2022 · GCE Paper 1 — Trigonometry
In the diagram, ABC is a straight line. Angle BCD = 90° and tan AB̂D = −34. Calculate the length of BD.
- A. 3 units
- B. 4 units
- C. 5 units
- D. 7 units
Verified working — step 1
A negative tangent cannot set side lengths - lengths are never negative. It only says angle ABD is OBTUSE; work with its acute supplement at B.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.
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