In order to do this, we divide the circumference by the diameter. If we have measured correctly, then the quotient will be somewhere between 3.1 and 3.2. The circumference of a circle is equal to the product of the number p and the circle's diameter. Now we can solve the problem given at the beginning of this section. This means we must prepare a strip of turf approximately 15.7 m. long.
Many calculators have a special button for the number p .
At home, measure the diameter and circumference of two different glasses. Calculate the quotients from dividing the circumferences of the circles by their respective diameters. Measure the diameter of the circle in figure 4.12 and calculate its circumference. Some boys and girls decided to organize a bicycle race after school. In order to decorate a room for New Year's Eve, Annie cut out circles with an 8-cm.