Well what question were you asked about this triangle?If I have opp = 30cm and hyp = 80cm and I divide them and I am left with 0.375 or whatever it is. Great. So sin = 0.375. Wonderful. Glad to know that. Now what!
The sine of an angle, in a right triangle, is the length of the leg opposite that angle, divided by the length of the hypotenuse. If the leg opposite angle A is 30 cm and the hypotenuse is 80 cm, then sin(A)= 30/80= 3/8= 0.375. If you want to find the measure of angle A you need to fine the inverse of the sine- your calculator has a "sin" key and either a " " or an "inv" key. Ask your teacher about how to use your specific calculator if you need to.The text does not explain what my 0.375 relates to, or what it is for? My angle is not 0.375 that does not sound right, the adj is not 0.375 either. What am I to do with my 0.375?
In any case, the point is that "0.375" is NOT the angle itself but the sine of the angle. To find the angle itself, you need to find the "inverse sine". The calculator that comes with Windows has an INV key. Entering "0.375", then clicking on the "INV" key the "sin" key turns to " " showing that it is now the invers function. Making sure the calculator is in "degree" mode, clicking on " " gives 22.02431... telling us that the angle is about 22 degrees.