How do you find the median of a set of data?
Select one
Find the value that occurs the most.
Place the values in order from least to greatest order and find the middle value.
Find the sum of the values and divide by the number of values in the set
Find the difference between the lowest value and highest value

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.

faster, im not sure why but i know it is faster

answer: the answer is d