circles with arc length

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 π r
• C = π d
• C = 2 π d

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

• diameter
• radius
• π
• center

A _____ is half of a circle.

• circumference
• pi
• semicircle
•  composite figure

Find the measure of arc AB.

• 17
• 34
• 68
• 146

Solve for the missing angle.

• 45^o
• 90^o
• 22.5^o
• 128^o

Angle Inside Circle

• A
• B
• C
• D

• A
• B
• C
• D

• 70

• 40

• 55

• 19

What is the measure of angle 1?

• 130
• 65
• 44
• 86

In  a circle, if a radius or diameter is perpendicular to a chord, then it____ the chord and its arc.

• equals
• bisects
• arcs
• circles