Question

Since the circumference is a little greater than 3 times the diameter, π is a number that is a little greater than 3. Use the symbol π to represent this special number. Pi is a non-terminating, non-repeating decimal, and mathematicians use the symbol π or approximate representations as more convenient ways to represent pi.

π = 3.14 or 227
Find the circumference of the circle in the picture.

Answer 1

Answer: about 69.54 cm

Explanation:

The diameter of a circle is given to be 21 centimetres. The formula for circumference of a circle given the diameter is πd, where d is the diameter and π is constant equal to 3.14... The question tells us to use 3.14, giving us the equation 3.14*21 cm. This multiplication results in 69.54 cm.