On a bicycle trail, the city is painting arrows like the one shown below:

calculate the area of the arrow by decomposing it into rectangles and triangles.
148.5 square centimeters
151.5 square centimeters
171 square centimeters
195 square centimeters

The answer is 151.1 :) Hope it helps!

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.

boxplot