An arrow is shot horizontally at 34.3m/s from a height of 18.00m How long before it strikes the ground ?
How far does the arrow travel horizontally?

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.

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answer: apothems is your answer

step-by-step explanation: hope u get it right