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" at right angles to a given straight line, from a given point in the same. Prop. 13. The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Prop. 14. If, at a point... "
The school Euclid: comprising the first four books, by A.K. Isbister - Σελίδα ii
των Euclides - 1863
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