In a right-angled triangle ABC, where angle B = 90° and angle A = 40°, which ratio correctly represents cos 40°?

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Question

In a right-angled triangle ABC, where angle B = 90° and angle A = 40°, which ratio correctly represents cos 40°?

Accepted Answer

AB/AC — Award 1 mark for identifying that cos θ = adjacent/hypotenuse. From angle A, AB is adjacent and AC is hypotenuse. A is incorrect — BC/AC = sin 40°. C is incorrect — BC/AB = tan 40°. D is incorrect — this is the reciprocal of tan 40°.

Answer

BC/AC

Answer

BC/AB

Answer

AB/AC

Answer

AB/BC

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