How do you find the area of a circle with just the radius?

Oh that's easy! You find out what the radius is ... then the diameter is another one of that number. Example say that the radius is 10 then the diameter is 20 or if the radius is 7 the diameter is 14

Use the formula A = π (r²) where r is the radius

Step-by-step explanation:

π = pi, and r is the radius. It's the only value you need to find the area of a circle. π is usually represented as 3.14, or you can use the π button on your calculator