Which of the following pairs can represent an acute angle ?

MATHEMATICS · Single correct · GCSE · Further Mathematics · Geometry and Trigonometry · Geometry and Trigonometry

Problem

Which of the following pairs (sin⁡θ,cos⁡θ)(\sin\theta,\cos\theta) can represent an acute angle θ\theta? (a) (0.7, 0.7)(0.7,\,0.7) (b) (0.6, 0.8)(0.6,\,0.8) (c) (0.4, 0.6)(0.4,\,0.6) (d) (0.45, 0.9)(0.45,\,0.9)

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