Circles

What does Pi times the diameter of a circle calculate?

• Area of the circle

• Circumference of the circle

• Diameter of the circle

• Radius of the circle

What operation do you perform on the radius to find the area of a circle?

• Double it

• Divide it by 2

• Multiply it by Pi

• Square it

How do you calculate the radius if you know the diameter of a circle?

• Multiply the diameter by Pi

• Square the diameter

• Divide the diameter by 2

• Double the diameter

What is the circumference of the Earth at the equator using the diameter given in the video?

• About 40,055 km

• About 200.96 meters squared

• About 12,750 km

• About 50.24 meters

Why is the area of a circle measured in square units?

• Because it is calculated using Pi

• Because it is a 2-dimensional quantity

• Because it involves squaring the radius

• Because it is a 1-dimensional quantity