U3 PBL - Conic Sections Circles

Front

What is a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the standard equation of a circle?

Back

The standard equation of a circle with center (h, k) and radius r is (x - h)² + (y - k)² = r².

Front

What does the radius of a circle represent?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius and is the longest distance across the circle.

Front

How do you find the circumference of a circle?

Back

The circumference C of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

What is the area of a circle?

Back

The area A of a circle is calculated using the formula A = πr², where r is the radius.

Front

What is the relationship between the radius and diameter?

Back

The diameter is equal to twice the radius (d = 2r).

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is a tangent to a circle?

Back

A tangent is a line that touches the circle at exactly one point.

Front

What is a secant line?

Back

A secant line is a line that intersects the circle at two points.