The answer is 2.1 if the height of the cylinder
well, first off, let's notice that we have a trapezoid with a rectangle inside it, so the rectangle is really "using up" area that the trapezoid already has.
now, if we just get the area of the trapezoid, and then the area of the rectangle alone, and then subtract that area of the rectangle, the rectangle will in effect be making a hole inside the trapezoid's area, and what's leftover, is the shaded section, that part the hole is not touching.

Rd st is xy yz (c) look at order. Rs is the first two and xy is the first two. Same for the second but last two.
The Exterior Angles of a Polygon add up to 360°, so there must be 9 sides, since 9*40=360.