Acircular pool has a radius of 20 feet. what is the area of the pool? use 3.14 for π. the area of the pool is about

Since you already know the radius multiply it by itself(20*20=400)then multiply that amount by 3.14.(formula: 3.14*(radius*radius)

The formula for area is

However, we are substituting pi for 3.14, so in this case the formula is 3.14×r^2
Here's a non-calculator method:
When r=20, A=3.14×20^2
20^2=400
Let's convert 3.14 into an integer by multiplying by 100, so we can deal with the numbers more easily:
314×400=(314×400)×100=125600
Now divide by 100 to put the decimal places of 3.14 back:
125600÷100=1256
If you noticed, we could have just cancelled out the decimal places in the 3.14 by dividing 400 by 100, meaning we could have just done 314×4
Besides this, the area of the pool is 1256ft^2