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" When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it. "
Euclid's plane geometry, practically applied; book i, with explanatory notes ... - Σελίδα 12
των Euclides - 1863
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...angle at a point, it may be expressed ' by a letter placed at that point ; as the angle at E.' VII. When a straight line standing on another straight line makes the adjacent angles equal to .one another, each of the angles is called a right angle ; and the straight line which stands on the...

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...only one angle at a point, it may be expressed by a letter placed at that point, as -the angle at E. 10. When a straight line standing on another straight...makes the adjacent angles equal to each other, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular...

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