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Paper 1 · June 2011 · Trigonometry

In triangle $ABC$ , $a = 14.7$ cm, $c = 17.3$ cm, $B = 64.2°$ and $C = 65.3°$ . Find angle $A$ correct to the nearest $0.1°$ .

A

50.5°

B

65.3°

C

115.5°

D

25.8°

Explanation

The angles of a triangle sum to

180°

:

A = 180° - 64.2° - 65.3° = 50.5°

.

Derived from ZIMSEC Mathematics Paper 1, June 2011, Q6

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