Understanding Circles: Vocabulary

What defines a circle?

• A shape with four equal sides

• A set of points equidistant from a center point

• A polygon with infinite sides

• A square with rounded edges

What is a radius in a circle?

• A line that divides the circle into two equal parts

• A line segment that connects two points on the circle

• The longest distance across the circle

• A line segment from the center to any point on the circle

What distinguishes a diameter from a chord in a circle?

• A chord never touches the circle's edge

• A diameter is any line segment within the circle

• A chord is always longer than a diameter

• A diameter passes through the center of the circle

How does a secant differ from a chord?

• A secant is always horizontal

• A chord passes through the circle's center

• A secant is a line that extends beyond the circle in both directions

• A secant never intersects the circle

What is a tangent to a circle?

• A line that intersects the circle at two points

• A curved line that mirrors the circle's edge

• A line segment within the circle

• A line that touches the circle at exactly one point

What is a central angle?

• An angle with its vertex at the center of the circle

• An angle with its vertex outside the circle

• An angle formed by two tangents

• An angle that is always obtuse

What defines a minor arc?

• An arc that spans more than half the circle

• An arc that measures less than 180 degrees

• An arc that is larger than a semicircle

• An arc that measures exactly 180 degrees

How is a major arc identified?

• By its curvature being less than a semicircle

• By using three letters to denote its path

• By its length being equal to the diameter

• By using two letters

What is the formula for the area of a circle?

• r/2π

• πd

• πr^2

• 2πr

How is the arc length of a circle calculated?

• 2π × Radius × (Degree of the arc / 360)

• Degree of the arc × Circumference / 360

• Degree of the arc × Radius / 360

• π × Diameter × (Degree of the arc / 360)