4. The most important Propositions are,-three, namely, Props. 4, 8, and 26, containing the criteria, or conditions of equality between triangles ; one Prop. 32, the equality of the exterior angle to the two interior and opposite angles, and of the three interior angles of every triangle to two right angles ; one Prop. 41, the proportion of the parallelogram to the triangle on the same base and between the same parallels ; and one Prop. 47, the relation between the hypotenuse and the sides about a rt. angle. These propositions at least must

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