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Mathematics, 25.03.2021 04:00 omojay1257
You have a shelf that holds 15 1/2 pounds. How many 1 1/4 pound books can the shelf hold?
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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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You have a shelf that holds 15 1/2 pounds. How many 1 1/4 pound books can the shelf hold?...
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