Answer: The circumference of the patio is 21.98 meters.
Step-by-step explanation: Given that there is a circular patio with a diameter of 7 meters. Greg is going to put a titled edge around the patio.
We are to find the circumference of the patio.
If 'r' units is the radius of a circle, then the circumference of the circle is given by
\(C=2\pi r.\)
Since the diameter of the circular patio is 7 meters, so the radius 'r' will be given by
\(\textup{radius}=\dfrac{1}{2}\textup{ of the diameter}\\\\\Rightarrow r=\dfrac{1}{2}\times 7\\\\\Rightarrow r=3.5~\textup{meters.}\)
Therefore, the circumference of the patio is given by
\(C=2\pi r=2\times 3.14\times 3.5=21.98~\textup{meters}.\)
Thus, the circumference of the patio is 21.98 meters.
