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If (x) is in the first quadrant and (\tan x=\frac{7}{24}), what is (\sin x)?

Answer and explanation

Correct answer: ( \frac{7}{25} )

The first-quadrant condition tells us that both sine and cosine are positive. The ratio \\(\\tan x=\\frac{7}{24}\\) means perpendicular divided by base is 7 divided by 24 in a right-triangle model. Take the perpendicular as 7 units and the base as 24 units. By the Pythagorean theorem, the hypotenuse is \\(\\sqrt{7^2+24^2}=\\sqrt{49+576}=\\sqrt{625}=25\\).

Sine is defined as perpendicular divided by hypotenuse. Therefore, \\(\\sin x=\\frac{7}{25}\\), so option A is correct. The first-quadrant information ensures that the positive value is selected; there is no negative sign. Option B is the cosine value for this triangle, while option D is the tangent value already given. Option C is greater than 1, which cannot be the value of sine for a real angle.

Related tags

Trigonometric-FunctionsQuadrantSine

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