Define a circle in your own words, based on the description provided in the video.

A circle is the set of all points equidistant from a central point.

What is the relationship between the radius and the diameter of a circle?

The diameter of a circle is twice the length of its radius.

Pi is the ratio of a circle's circumference to its diameter.

I can define and apply the terms radius, diameter, chord, tangent, secant, and arc to solve problems involving circles.

1
The radius of a circle is the distance from the center to any point on the circle, while a chord is a line segment with both endpoints on the circle.
2
A diameter is a chord that passes through the center of the circle, and its length is always twice the length of the radius.
3
The distance around the circle is called the circumference, and the ratio between the circumference and the diameter is represented by π (pi).