Mathematics, 25.08.2019 21:30 kayleahwilliams6

The rectangle and the square shown have the same perimeter? ?
what is the perimeter of each? !

The rectangle and the square shown have the same perimeter? ? what is the perimeter of each?

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Mathematics, 20.06.2019 18:04

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

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Mathematics, 21.06.2019 21:30

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The rectangle and the square shown have the same perimeter? ?
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