Nanci is volunteering at the animal shelter .she wants to spend an equal amount of time playing with each dog. she has 145 minutes to play with all 7 dogs .about how much time can she spend with each dog?

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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