Which statements are true about all prime numbers? choose exactly two answers that are correct. a. they are whole numbers greater than 1. b. if they are divided by 2, there will be no remainder. c. they are odd numbers. d. they have only 2 factors.

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.