Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 134
as anexercise for the student. Ex. 429. Construct an arc of 45°; of 30°. Construct an arc of 30°,using a radius twice as long as the one previously used. Are these two30° arcs equal ? Ex. 430. Distinguish between finding the mid-point of an arc andthe * center of an arc. BOOK II 123 Proposition… … I. Given circle 0 with chord AB = chord CD, and let OE andOF be the distances of AB and CD from center 0, respectively. To prove OE = OF. Argument 1. Draw radii OB and OC, 2. E and F are the mid-points of AB and CDy respectively. 3. .-.in rt. A OEB and OCF, EB = CF. 4. OB = OC, 5. .-. A OEB = A…
Geometry, Plane · Geometry, Solid
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