Find the radius of the circle if its length is 26.376mm.

A circle is a flat geometric figure whose points are equidistant from a given point, the center of the circle.
We write the formula for the circumference of a circle through the radius:
l = 2πr,
where l is the circumference, r is the radius, π = 3.14159.
Let us express the radius of the circle from the formula:
r = l / 2π.
Substituting the known values of the circumference and constant π into the formula, we find the radius of the circle:
r = l / 2π,
r = 26.376 / (2 × 3.14) = 4.2 mm.
Answer: The radius of the circle is 4.2 mm.