Answer:
Not necessarily words, because there is nothing hard to define in geometry, something hard to LEARN is theorems and postulates though.
Step-by-step explanation:
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D. None. Say the obtuse angle is 100 degrees. Since the sum of all angles in a triangle cannot be bigger than 180, it's not possible because 195 (100+95) is greater than 180 degrees.
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Any right triangle can.
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