Exploring Circumference and Area of Circles

What is the definition of a circle?

• A shape with four equal sides

• All points in a plane at a fixed distance from the center

• A polygon with three sides

• A set of points forming a square

What does the radius of a circle represent?

• The distance across the circle through the center

• The distance from the center to any point on the circle

• The distance around the circle

• The length of two sides of the circle

How is the diameter of a circle related to the radius?

• The diameter is equal to the radius

• The diameter is twice the radius

• The diameter is one-third the radius

• The diameter is half the radius

What is the circumference of a circle?

• The area of the circle

• The distance across the circle

• The distance around the circle

• The length of two radii

Which number is used to represent Pi?

• 5.14

• 4.14

• 3.14

• 2.14

What is the relationship between the circumference and the diameter of a circle?

• The circumference is twice the diameter

• The circumference is half the diameter

• The circumference is Pi times the diameter

• The circumference is three times the diameter

How do you calculate the circumference using the diameter?

• Pi times the diameter

• Pi plus the diameter

• Pi minus the diameter

• Pi divided by the diameter

If the diameter of a circle is 10 units, what is the circumference?

• 20 Pi units

• 62.8 units

• 10 Pi units

• 31.4 units

What is the formula for the area of a circle?

• Pi plus the radius squared

• Pi divided by the radius

• Pi times the radius squared

• Pi minus the radius squared

How can you find the radius if you know the area of a circle?

• Divide the area by Pi and then square the result

• Multiply the area by Pi and then square the result

• Multiply the area by Pi and square root the result

• Divide the area by Pi and square root the result