You can use pi to calculate the circumference and area of a circle. Pi is represented by the symbol π and is a number which is approximately 3.141592.

What is a commonly used value of ?

Which of the following is not a formula to find the circumference of a circle?

What is the formula to find the area of a circle?

What is the circumference of a circle that has a diameter of ?

What is the circumference of a circle that has a radius of ?

What is the diameter of a circle that has a circumference of ?

What is the area of a circle that has a radius of ?

What is the area of a circle that has a diameter of ?

What is the area of a half circle that has a radius of ?

What is the radius of a circle that has an area of ?