Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Boston, Ginn & company · leaf 133
177. A portion of a circle cut off by an arc and two radiidrawn to its extremities is called a sector, and the centralangle standing on that arc is called the angle of the sector. In the figure. OAB is a sector, and LAOB is its angle. 116 PLANE GEOMETRY. [Bk. III. 1. CENTRAL ANGLES.Proposition I.… … Given M, M, two equal circles, and central anglesAOB = AOB, AOOAOB. To prove that AB = A^B, and AC > jVB. Proof. 1. Place O M on O M so that Z AOB coincides withits equal Z A OB.Then A coincides with A, and B with B. § 165, def. 0 2. Then AB coincides with AB, because its points areequidistant…
Geometry
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