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Mathematics 26 Online
OpenStudy (anonymous):

In a geometry class, the students were asked to prove the theorem below by contradiction. Theorem: A quadrilateral cannot have three and only three right angles. Heather begins the proof with an assumption. Which statement will she most likely use as an assumption? Let one angle of a quadrilateral be acute and the other three angles obtuse. Let all angles of a quadrilateral measure 90° each. Let all angles of a quadrilateral be acute. Let one angle of a quadrilateral be obtuse and the other three angles measure 90° each.

OpenStudy (cwrw238):

proof by contradiction starts by assuming that the opposite is true - that in this case a quadrilateral has only three right angles. the last option is most likely

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