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If the diagonals of a parallelogram are equal in length, show that the parallelogram is a rectangle? What is the area of a parallelogram whose vertices are A(-12, 2), B(6, 2), C(-2, -3), D(-20,-3)? Given that x is a normal variable with mean μ = 49 and standard deviation σ = 7.1, find the following probabilities. P(x ≤ 60)? What is the external temperature of the liquid nitrogen tank? Why sometime the other half of my body felt weaker?