Given: angle 2 = angle 3 angle 4 = angle 5prove: rs = rt

I would go with 5. Triangle VSR congruent to Triangle VTR.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo