Talula is standing 117 feet from tae base of the washington
monument in washington, d. c. she uses her clinometer to
measure the angle of elevation to the top of the monumeni to
be 78°. if talula's eye height is 5 feet, 3 inches, what is the
height of the washington monument?

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:

dong do iy iys a scram