Circle Area and Circumference Problems

The video tutorial covers the review of calculating the circumference of circles and introduces the concept of calculating the area of circles. The teacher provides examples of both exact and approximate calculations for the circumference and area, using pi and its approximation, 3.14. The video concludes with instructions for independent work and worksheet activities.

What is the exact circumference of a circle with a diameter of 5?

• 31.4

• 5π

• 10π

• 15.7

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

• 31.4

• 10π

• 15.7

• 3.14

How do you calculate the area of a circle?

• π times radius squared

• π times diameter

• 2π times radius

• π times diameter squared

What is the exact area of a circle with a radius of 3?

• 9π

• 6π

• 3π

• 12π

If the diameter of a circle is 8, what is the exact area?

• 64π

• 32π

• 8π

• 16π

What is the approximate area of a circle with a radius of 7?

• 153.86

• 28.26

• 49π

• 21.98

How do you find the approximate area of a circle with a diameter of 6?

• Multiply 3.14 by the radius

• Multiply 3.14 by the diameter squared

• Multiply 3.14 by the diameter

• Multiply 3.14 by the radius squared

What is the approximate area of a circle with a diameter of 4?

• 25.12

• 8π

• 16π

• 12.56

If the radius of a circle is 1, what is the approximate area?

• 12.56

• 3.14

• 1π

• 6.28

What is the approximate area of a circle with a radius of 100?

• 314000

• 314

• 3140

• 31400