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7) According the Hinge Theorem, if two sides of one triangle are congruents to two sides of another triangle, and the included angle of the first is larger than the included angle of the second, then the third side of first triangle is longer than the third side of the seconds triangle.
Because of <P < <X
PQ = XY
PR = XZ
➣So the Correct Answer is QR <YZ.
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8) According to the Hinge Theorem.
WN = QR
NY = RS
<N > <R
➣So the Correct Answer is AC > XZ.
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9) The sum of two sides is greater than the third side, the sum of the two sides is less than the third side.
8 - 4 = 4 8 + 4 = 12
4 < X <12
➣So the Correct Answer is X < 120.