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" The straight lines which join the extremities of two equal and parallel straight lines towards the same parts, are also themselves equal and parallel. "
Euclid's Elements of geometry, books i. ii. iii. iv - Σελίδα 33
των Euclides - 1862
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...triangle ABC is equal to the triangle ADC, the diameter of course bisects it. Therefore, &c. QED Cor. The straight lines which join the extremities of two...same parts, are also themselves equal and parallel. PROP. XV. THEOREM. Parallelograms upon the same base, and between the same parallels, are equivalent....

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