- The circumference of a circle is 90cm. Calculate the radius to the nearest cm.
- How many cookies, with a radius of 4cm each, can be cut out of a rectangular slab of cookie dough that measures 31cm by 52cm?

*Is calculating the circumference necessary?* - A car tire has a radius of 30cm. A stone gets stuck in the tire. How many times will it hit the ground when the car travels a distance of 500m?