SSC CGL – Combined Graduate Level Examination · प्रश्न 72
An annular region has outer radius 12 cm and inner radius 8 cm. What is the approximate ratio of the annular area to the whole outer circle?
उत्तर देखें और व्याख्या
उत्तर: (B) 5:9
व्याख्या
(12² - 8²)/12² = 80/144 = 5 : 9.