The circumference of the circle is approximately 119.38 kilometers.
It is an exercise where the calculation of the circumference of a circle is made from its radius, it is a very common mathematical operation. The circumference is the distance a point on the edge of a circle moves around its center, and the radius is the distance from the center of the circle to its edge.
The formula to calculate the circumference of a circle from its radius is:
Circumference = 2πr
Where "r" is the radius of the circle and "π" is a mathematical constant approximately equal to 3.14. Therefore, the circumference of the circle is obtained by multiplying "π" twice by the value of the radius "r".
It is important to remember that the radius and circumference of a circle are related in a directly proportional way: as the radius increases, so does the circumference, and vice versa.
Then calculate the circumference of the circle.
Therefore we apply the formula C =2πr. What we must do is substitute the radius and the value of pi in the formula and solve, then
C =2πr
C = 2 × 3.14 × 19 km
C = 119.32 km
The circumference of the circle is approximately 119.32 kilometers.
The circumference of the circle can change, varying the value that we give to pi.