Circles Review

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, and it is two times the radius.

Front

What is a secant line?

Back

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

Front

What is the center of a circle in the equation (x+2)²+(y-3)²=4?

Back

The center of the circle is at the point (-2, 3).

Front

How many degrees are in a full circle?

Back

There are 360 degrees in a full circle.

Front

What is the arc length of arc XY if it is 2π?

Back

The arc length of arc XY is 2π.

Front

What is the radius of a circle?

Back

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

Front

What is a tangent line?

Back

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

Front

What is a chord in a circle?

Back

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

Front

What is the formula for the circumference of a circle?

Back

The circumference C of a circle is given by 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 given by the formula A = πr², where r is the radius.