A groundskeeper needs grass seed to cover a circular field, 280 feet in diameter.
A store sells 25-pound bags of grass seed. One pound of grass seed covers about 400 square feet of field.
What is the smallest number of bags the groundskeeper must buy to cover the circular field? Explain or show your reasoning.
Step 1: Find the area of the circular field.
Step 2: Find out how many bags of grass seed you will need.
