
Mike D. answered 05/26/21
Effective, patient, empathic, math and science tutor
For 1. The sin relates the opposite and hypotenuse so use that
For 2. The tangent relates the length of the two legs. Find the tangent as a number then use inv tan to find the angle
For 3. the sum of one pair of sides must be longer than the third side. Is that the case here ?

Addison K.
Mike, I really appreciate you taking time out of your day to try and help me, but I do not have a calculator with me so can you tell me the answer for the first two? I really appreciate everything nonetheless.05/26/21
Mark M.
For 3., 18^2 + 80^2 = 85^2?05/26/21