Circles Concepts

Name a semicircle.

• arc ABD

• arc AB

• arc BD

• arc ADB

What is the measure of arc AB?

• 140

• 142

• 180

• 153

Solve for x. 

• 5

• 20

• 40

• 85

What is the formula for calculating the circumference of a circle?

• C = πd

• C = 2r

• C = πr^2

• C = 2πr

What is the radius of a circle?

• The radius is the distance from the center to any point on the circle.

• The radius is twice the length of the diameter.

• The radius is equal to the circumference.

• The radius of a circle is half of its diameter.

Define the term 'circumference' in relation to circles.

• The circumference is the distance around a circle.

• The circumference is the diameter of a circle.

• The circumference is the area of a circle.

• The circumference is the radius of a circle.

What is the area of a circle?

• A = r² + h²

• A = πr²

• A = πd

• A = 2πr

State the Inscribed Angle Theorem.

• The measure of an inscribed angle is equal to the measure of the intercepted arc.

• The measure of an inscribed angle is twice the measure of the intercepted arc.

• The measure of an inscribed angle is the same as the central angle that subtends the same arc.

• The measure of an inscribed angle is half the measure of the intercepted arc.

What is the relationship between the angles formed by two intersecting chords?

• The angles are equal to the measures of the arcs they intercept.

• The angles are equal to the difference of the measures of the arcs they intercept.

• The angles formed by two intersecting chords are equal to half the sum of the measures of the arcs they intercept.

• The angles are equal to the sum of the measures of the arcs they intercept.

What is the definition of a chord in a circle?

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

• A chord is a line segment that extends outside the circle.

• A chord is a point on the circumference of the circle.

• A chord is a line that passes through the center of the circle.