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Mathematics, 03.03.2021 22:40 whatsittoya4261
The angle measures of a triangle are shown in the diagram below.
What is the value of x?
Record your answer in the grid. Be sure to use correct place value.
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Answers: 2
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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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The angle measures of a triangle are shown in the diagram below.
What is the value of x?
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