math
posted by kudu .
An angle of 1.8 radians at the center of the circle subtends an arc of length 23.4cm.
Find:
(a) The radius of the circle
(b) The area of the sector enclosed by the arc and the radii.

r = 23.4/1.8 = 13
a = 1/2 * 13^2 * 1.8
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