Show all work on a piece of paper please and please round to the nearest hundredth if necessary

Find the indicated measure. Round to the nearest hundredth, if necessary. 1. the circumference of a circle with radius 15.6 cm. 2. the diameter of a circle with circumference 266 in. / . 3' mAB 4. length of a A 23.88 in. B A \\ (1" 5. About 1.6 million people live in a region with a 6. A 20-inch diameter bicycle tire rotates 200 times. 9-mile radius. Find the population density. How many feet does the bicycle travel? Round your answer to the nearest foot. 7. Find the surface area of the solid. 8ft Find the area of the regular polygon. Round to the nearest tenth