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The vertices of a parallelogram are A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4). Which of the following must be true if parallelogram ABCD is proven to be a rectangle? A- (y4−y3x4−x3=y3−y2x3−x2) and

asked Jan 26, 2017

Mathematics
high-school

2 answers

0 votes

22.2k views

An approaching storm is moving at 15 km/hr. what do you need to know to determine its velocity

asked Oct 27, 2016

Mathematics
middle-school

1 answer

4 votes

19.2k views

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