Parts of Circles and Central Angles

What is the diameter of a circle?

• A line segment that passes through the center of the circle and has its endpoints on the circle.

• The distance around the circle.

• The length of the radius multiplied by two.

• A line segment that connects any two points on the circle.

Tags

CCSS.HSG.C.A.2

What is a central angle?

• An angle formed by two chords in a circle.

• An angle whose vertex is at the center of the circle and whose sides are radii that extend to the circumference.

• An angle formed by two tangents to a circle.

• An angle that measures more than 180 degrees.

Tags

CCSS.HSG.C.A.2

What is the formula for the area of a circle?

• A = 2πr

• A = πr²

• A = πd

• A = r²

Tags

CCSS.7.G.B.4

What is the radius of a circle?

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

• The radius is the length of the circle's diameter divided by two.

• The radius is the distance around the circle.

• The radius is the area of the circle divided by its circumference.

Tags

CCSS.HSG.C.A.2

If the radius of a circle is 10 cm, what is the circumference?

• 10π cm

• 20π cm

• 30 cm

• 15 cm

Tags

CCSS.7.G.B.4

What is the circumference of a circle?

• C = πd

• C = 2πr

• C = r^2

• C = 2r

Tags

CCSS.7.G.B.4

How do you calculate the measure of a central angle?

• The measure of a central angle is equal to the measure of the arc it intercepts.

• The measure of a central angle is half the measure of the arc it intercepts.

• The measure of a central angle is equal to the sum of the angles in the triangle formed by the arc.

• The measure of a central angle is always 90 degrees.

Tags

CCSS.HSG.C.A.2

What is the relationship between the radius and diameter?

• The diameter is equal to the radius (d = r).

• The diameter is twice the length of the radius (d = 2r).

• The radius is twice the length of the diameter (r = 2d).

• The radius and diameter are the same length.

Tags

CCSS.7.G.B.4

What is a minor arc?

• An arc that is larger than a semicircle.

• An arc that is equal to a semicircle.

• An arc that is smaller than a semicircle.

• An arc that is a full circle.

Tags

CCSS.HSG.C.B.5

What is a major arc?

• An arc that is smaller than a semicircle.

• An arc that is equal to a semicircle.

• An arc that is larger than a semicircle.

• An arc that is a quarter of a circle.