Which point is the center of the circle

The center of a circle is the point equidistant from the points on the edge. Similarly the center of a sphere is the point equidistant from the points on the surface, and the center of a line segment is the midpoint of the two ends.

hope it helps

Do You Have Picture

Step-by-step explanation:

Mostly likely the focus of the circle, when solving circumference the radius is half of the circle, to the point of the center the circle.

the answer is 15% decrease

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse