Circle Geometry Concepts and Formulas

What is the term for the fixed point from which all points on a circle are equidistant?

• Radius

• Circumference

• Center

• Diameter

Which of the following represents the distance from the center of a circle to any point on its circumference?

• Arc

• Diameter

• Radius

• Chord

What is the formula for the area of a circle?

• πd

• 2πd

• 2πr

• πr^2

How is the circumference of a circle calculated?

• r^2

• πd

• 2πr

• πr^2

What is an arc in the context of a circle?

• A straight line inside the circle

• The diameter of the circle

• A curved line on the circle's circumference

• The radius of the circle

How is a minor arc different from a major arc?

• Major arc is less than half the circle

• Minor arc is longer

• Minor arc is less than half the circle

• Major arc is shorter

What is the central angle in relation to an arc?

• The angle at the circle's diameter

• The angle at the circle's edge

• The angle at the circle's center

• The angle at the arc's midpoint

Which formula is used to calculate the length of an arc?

• (Central angle/360) * 2πr

• Central angle * r

• πr^2

• 2πr

If the central angle is 90 degrees, what fraction of the circle's circumference is the arc length?

• 1/6

• 1/4

• 1/2

• 1/3

What is the relationship between the central angle and the arc length?

• Equal

• No relation

• Inversely proportional

• Directly proportional