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RST is a triangle with right angle S. If s- 21.3 Angstroms and t=8.71 Angstroms, find the measure of the larger acute angle.

  • Trig/Math -

    t + r > s,
    8.71 + r > 21.3,
    r > 21.3 - 8.71,
    r > 12.6.
    Therefore, R is the larger acute angle.

    cosR = t/s = 8.7 / 21.3 = 0.40845,
    R = 65.9 Deg.

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