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The Pamphlet Collection of Sir Robert Stout: Volume 78

—Section B.—Theoretical Geometry.— — Angles at a Point

—Section B.—Theoretical Geometry.—

Angles at a Point.

If a straight line stands on another straight line, the sum of the two angles so formed is equal to two right angles; and the converse.

If two straight lines intersect, the vertically opposite angles are equal.