IMathAS-libretexts

Finding the Circumference of a Circle
Use Figure A to answer the following questions.
Figure A [Graphs generated by this script: initPicture(10-8-1,10+8+1,10-8-1,10+8+1); strokewidth=3; circle([10,10],8);line([10-8,10],[10+8,10]);fontsize = '18';fontstyle = 'bold'; text([10,10],'16 m' ,above); ]
Does Figure A label the radius or the diameter of the circle?
Which formula uses the value (radius or diameter) that you are given in the diagram? $\displaystyle {C}={2}\cdot\pi\cdot{r}$ $\displaystyle {C}=\pi\cdot{d}$
Find the exact circumference of the circle using $\displaystyle \pi$ in your answer. (Type pi for $\displaystyle \pi$ ) m
Approximate the circumference by entering the exact circumference using $\displaystyle \pi$ *into your calculator*. m Round your result to two decimal places. Note: If your calculator doesn't give you a decimal, click the double arrow button above the enter button.
Approximate the circumference by using 3.14 for $\displaystyle \pi$ in the formula. Round your results to two decimal places. m *Round your result to two decimal places.*