a restaurant has 48 possible meals thst you can choose. A meal has a main course, a salad, and a dessert. The menu lists 6 main courses and 2 salads.. How many desserts are available?​

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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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