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If cot θ = 1 and θ is acute, then what is θ?

Answer and explanation

Correct answer: 45°

\(\cot \theta=\frac{\text{base}}{\text{perpendicular}}\). At \(45°\), the base and perpendicular are equal, so \(\cot 45°=1\). Hence, \(\theta=45°\). For comparison, \(\cot 30°=\sqrt{3}\) and \(\cot 60°=\frac{1}{\sqrt{3}}\). Also, \(90°\) is not acute and \(\cot 90°=0\). Exam tip: Remember that \(\tan 45°=\cot 45°=1\).

Related tags

TrigonometryCotangentStandard AnglesAcute AnglesClass 10 MathematicsValues Of Trigonometric Ratios For Specific Angles: 30°45°And 60°Values Of Trigonometric Ratios For Specific Angles 30 45 And 60Introduction To Trigonometry

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