1. Be sure that your graphing calculator is in degree mode.
2. Press sin(
3. Press 72, )
4. Press Enter
The calculator shows: .9510565163
5. Round to .95
Answer: sin 72° = .95
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90 degrees - 72 degrees = 18 degrees -------------------
72 degrees is an acute angle
sin(90) = 1
If sin(theta) is 0.9, then theta is about 64 degrees or about 116 degrees.
sin(360+30) =sin(30)= 1/2