Posted by **Gregory** on Tuesday, November 22, 2011 at 11:15am.

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 -
**Henry**, Thursday, November 24, 2011 at 12:17pm
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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