How are each of the ratios constructed on the circle? For example sinθ is the y coordinate opposite to θ

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

The answer is 1 because you have to flip the sign when dividing by negative number and 3