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If the complement of an angle is (\frac{1}{5}) of its supplement then what is the angle?

Answer and explanation

Correct answer: (67^\circ30')

The direct answer is C, \\(67^\circ30'\\). Let the angle be \\(x\\). Its complement is \\(90^\circ-x\\), and its supplement is \\(180^\circ-x\\). The statement gives \\(90^\circ-x=\frac{1}{5}(180^\circ-x)\\). Multiply by 5: \\(450^\circ-5x=180^\circ-x\\). Rearranging gives \\(270^\circ=4x\\), so \\(x=67.5^\circ=67^\circ30'\\). Option C is correct. Option A, 60°, gives complement 30° and supplement 120°; 30° is not one-fifth of 120° (it would be one-fourth). Option B, 65°, gives 25° and 115°, which do not satisfy the ratio. Option D, 72°, gives 18° and 108°; the ratio is one-sixth, not one-fifth. The angle is between 0° and 90°, as required for a positive complement. Memory cue: write complement as \\(90-x\\) and supplement as \\(180-x\\) before forming the equation.

Related tags

Trigonometric-FunctionsComplementary-AnglesSupplementary-Angles

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