Four freinds share 10 cookies equally. how many cookies does each freind get?

2.5 or two and a half ( same thing)

Step-by-step explanation:

-18 degrees is the answer : )

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.