Aclosed gaussian cylinder sits centered around the z-axis and above the xy-plane with a length of a and a radius of r. the electric field is given by e = (2r)cosθ r + cosθ θ+ (2z-3) z. what is the net charge contained in the cylinder?

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:

two pairs of adjacent sides are of equal length. this implies that one diagonal divides the kite into congruent triangles, and so the angles between the two pairs of equal sides are equal in measure. it also implies that the diagonals are perpendicular.

- (2, -7)

- lines r and s and lines t and u must be parallel

are ya tryin to ask something or is this a statement