A 3cm x 3 cm rectangle sits inside a circle
with radius of 4 cm.
What is the area of the shaded region?

THE CORRECT ANSWER IS 41.27 cm^2

Step-by-step explanation:

3 cm x 3cm = 9 cm^2

16 pi cm^2 - 9 cm^2 = 41.27 cm^2

I know this is the correct answer because it was correct on khan academy!

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.

; )

step-by-step explanation: ; )