Circumference and Circle Calculations

The video tutorial explains how to calculate the circumference of a circle. It begins with defining circumference and its relation to diameter and radius. The instructor demonstrates how to convert radius to diameter and use the formula C = πD to find the circumference. Detailed multiplication steps are shown, and the result is discussed, emphasizing the use of an estimate for π.

What is the circumference of a circle?

• The volume of a sphere

• The distance around a circle

• The area of a circle

• The distance around a square

Which formula is used to calculate the circumference of a circle?

• C = 2πr

• C = πd

• C = πr²

• C = 2πd

If the radius of a circle is 18, what is the diameter?

• 36

• 9

• 72

• 18

What value is commonly used as an approximation for π in calculations?

• 3.00

• 3.14

• 3.50

• 3.75

What is the result of multiplying 6 by 3.14?

• 18.84

• 19.84

• 20.84

• 21.84

How many decimal places should be considered in the final answer for circumference?

• 2

• 4

• 3

• 1

What is the approximate circumference of the circle in the example?

• 110.04

• 112.04

• 113.04

• 114.04