Created by StemPy LabWhich of these is not enough, on its own, to prove that two triangles are congruent?
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← Mina doubles 2x + 3y = 12 and subtracts 4x + 6y = 20. She is left with 0 = 4. What does this tell her?A carpenter cuts two triangular tiles that fit exactly on each other, so that P, Q and R land on L, M and N in turn. The tile PQR has an angle of 57° at Q. How large is the angle at M on the other tile? →
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