Special Segments in Circles

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

Define a diameter of a circle.

Back

A diameter is a chord that passes through the center of the circle, dividing it into two equal halves.

Front

What is a radius of a circle?

Back

A radius is a line segment from the center of the circle to any point on the circle.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius (Diameter = 2 × Radius).

Front

What is a tangent to a circle?

Back

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

Front

Define a secant line.

Back

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

Front

What is the arc of a circle?

Back

An arc is a portion of the circumference of a circle.

Front

What is the central angle of a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii.

Front

How do you calculate the length of an arc?

Back

Arc Length = (Central Angle/360) × Circumference of the circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.