Kyle is at the end of a pier 30 feet above the ocean. his eye level is 3 feet above the pier. he is using binoculars to watch a whale surface. if the angle of depression of the whale is 20 degrees, how far is the whale from kyle's binoculars? round to the nearest tenth foot.

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.

add an image, and i will answer

step-by-step explanation:

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