Circle Geometry Concepts and Formulas

This video tutorial covers the basics of circles, including definitions and properties such as radius and diameter. It explains the formulas for calculating the area and circumference of a circle. The tutorial then introduces arcs, distinguishing between minor and major arcs, and provides a method for calculating arc length using the central angle and circle circumference.

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