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Lines, Angles, and Triangles

SAT Math· difficulty 3/5

If sintheta=frac725\\sin\\theta = \\frac{7}{25}, what is cos(90°−theta)\\cos(90° - \\theta)?

  • A

    257\frac{25}{7}

  • B

    2425\frac{24}{25}

  • C

    17\frac{1}{7}

  • D

    725\frac{7}{25}

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Explanation

By the complementary angle identity: cos(90°−theta)=sintheta=frac725\\cos(90° - \\theta) = \\sin\\theta = \\frac{7}{25}.

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