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GEOMETRY

Of four points are collinear, they are also coplanar

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?