book Maths Puzzle Numerical Ability

HELP! I'm stuck on something that should be easy....."leaft cutter ants that live in Central & South America, weight about 1.5grams on ant can carry a 4 gram peice of leaf that is

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How do you know the angles of hypotenuse and obtuse? I need to know if I have this question right or not, In the ordered pair(12,-7) ? Is the the abscissa 12 and the ordinate -7? Please tell me if I am right or not, please.