Circles Vocabulary Radius Diameter Area Circumference

The portion inside of the circle

• Area

• Circumference

• Angle

• Arc

A straight line segment that passes through the center of a circle and whose endpoints lie on the circumference of the circle is called the ____.

• Diameter

• Radius

• Circumference

• Area

If a radius of a circle is 24 m, what is the diameter?

• 12 m

• 32 m

• 25 m

• 48 m

What is the formula to find the area of a circle?

• A = πd

• A = 2πr

• A = πr²

• A = xyz

A straight line from the center of a circle to the circumference is called the ____.

• Diameter

• Circumference

• Radius

• Area

What is the diameter?

• 8 cm

• 16 cm

• 10 cm

• 4 cm

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.

• The measurement around the circle

• The measurement from and edge of the circle to another edge through the center

• A line perpendicular to the diameter of the circle

What is the distance around a circle?

• Circumference

• Area

• Diameter

• Radius

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

The diameter is 3. What formula would I use to find the circumference?

• C = πd

• C = π2r

• C = 2r