 ... are equal to two right angles. Let ABC be a triangle, and let one of its sides BC be produced to D ; the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC ; and the three interior angles of the triangle, viz. ABC, BCA, CAB,...  A Treatise on Practical Gauging - Page 62by Anthony Nesbit, W. Little - 1822Full view - About this book
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