If a circle O has radius r and arc AB of circle O has a central angle of 18°, then
(a) the ratio of the length of AB to the area of sector AOB is 1:2.
(b) if P is on circle O, ?APB = 1°8.
(c) ?AOB = 9°.
(d) the ratio of the minor arc AB to the major arc is 1:20.
(e) None of these is correct.
(e) None of these is correct.
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