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Which figure must be a square? A. a parallelogram with four congruent sides B. a quadrilateral with four right angles C. a quadrilateral with congruent sides D. a rhombus with four right angles
answered
May 29, 2016
Mathematics
middle-school
6
votes
61.9k
views
Solve equation e^{2x} + 2e^{x} −3 = 0
answered
May 9, 2015
Mathematics
high-school
6
votes
120k
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