In a circle centered at point o, the ratio of the area of sector aob to the area of the circle is 3/5. what is the measure, in degrees, of the central angle corresponding to arcab? 72 120 180 216 245

You find a mysterious, dull substance on the ground and pick it up for a closer look. it is powdery, very light, and soft to the touch. the substance is most likely i. an organic mineral ii. a metallic mineral iii. a nonmetallic mineral i only ii only iii only i and ii i and iii