The circumference of a circle is C centimeters. The diameter of the circle is 13 centimeters. Which expression best represents the value of π

Pls me this is due today and i need i will make brainliest if you me answer correctly and i will report if you try to give me a dumb answer.

Which of the following statements is not true? a.parallel lines are lines in the same plane that never intersect. b.congruent figures have the same shape and same size angles and sides. c.similar figures must have the same shape and the same size. d.a rotation is when you turn a figure around a certain point.

What is the difference between regular convex and concave polygons