How could we understand that the right triangles of trigonometry with a hypotenuse of measure 1 represent all possible right

Ultimately, the similarity of triangles is the basis of proportions between sides of two triangles, and these proportions allow for the calculations of which we are speaking here

step-by-step explanation:

rectangles are made up of 4 right angles, which means that a side and a base meet perpendicular to one another.   their slopes then have to reflect perpendicular slopes.   perpendicular slopes are opposite reciprocals of one another.   for example, if the slope of one line is +2/3, then the perpendicular slope to that would be -3/2.   so we look for that combination in our choices.

all of them satisfy that condition (so what's the question, i guess? )