To determine the area if the circle, you must know the diameter or the radius of a circle.
If you know the radius of a circle, use this as your formula. Remember: Pi (the greek symbol thingy) is equal to 3.1415. (A is equal to area of the circle and r represents the radius) If you know the diameter, just divide the diameter to get the radius then use the same equation.
So if you are given that the diameter of a circle is 10 feet, we know the radius is half the diameter. So the radius is 5. So the equation is going to be 3.14*5^2 so the area would be about 78.54 feet
This is an experiment because a treatment was applied to a group.
Step-by-step explanation:
This is because it cannot be a survey since the children are taking a test, which has a hypothesis. Hope you get this right. I took the test and got right.