(i) A quarter turn = 360o / 4= 90o. Since 360o = 2 ${\pi}$ radians.
Alternately since 1 radian = 57.3o hence 90o = 1.57 radii.
(ii) A point on the circumference moves through an arc, Arc = radius × ${\theta}$ (${\theta}$ in radians) = 50 cm × 1.57 = 78.5 cm.
Mutiso answered the question on October 16, 2018 at 05:36
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