Area of a Circle
In the formula for the area of a circle, what is pi?
3.14
What is a sphere?
It is a shape like a ball, or the earth. Like a 3 dimensional circle.
In the formula for the volume of a cylinder, what is H?
height
In the formula for the area of a circle, what is the radius?
The radius is half of the diameter. It is the distance from the center of the circle to the edge.
What is pi?
3.14
For Cylinder A, the height is 20 cm and the diameter is 12 cm. What is the radius?
The radius is half of the diameter, so it is 6 cm.
In the formula for the area of a circle, the radius has an exponent of 2. What does that mean that we should do to the radius?
The radius is squared meaning radius times radius. For example, if the radius is 12, then radius squared is 144.
In the formula for the volume of a sphere, the radius is cubed. What does that mean?
The volume of a cylinder is pi times radius squared times height. Pi is 3.14 and the radius is 3 cm squared. What is Pi times the radius?
9.42 cm squared
What is the formula for the area of a circle?
What is 4/3 times 3? Explain your answer.
4. We multiply 4/3 times 3/1. The 3's cancel each other out and we are left with 4/1 which equals 4.
The volume of a cylinder is pi times the radius squared times the height. The radius is 6 inches squared and the height is 12 inches. What is the volume?