The circumference of a circle is 6.28 meters. what is the circle's radius? also how do i know

Formula: C= 2(pi)r

C = 6.28
pi = 3.14
r = ?

6.28 = 2(3.14)r
6.28 = 6.28r

r = 1

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c