SSC CGL – Combined Graduate Level Examination · प्रश्न 71
An annular (ring-shaped) disc has outer and inner radii of 12 cm and 8 cm. What percentage of the full circle is this ring?
उत्तर देखें और व्याख्या
उत्तर: (B) 55.56%
व्याख्या
(144 − 64)/144 = 55.56%.