Circles and Arcs

what is this shape called

• circle

• semi circle

• moon

• triangle

What is the diameter?

• 8

• 16

• 10

• 4

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

• 3 m 

• 9.42 m

• 12 m

• 18.84 m

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

A circle has a radius of 23 feet. What is the diameter of the circle?

• 23 feet

• 46 feet

• 1/2 feet

• none of the above

find the area of the circle with radius 3 cm below.

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Which of the following names a radius?

• segment AC

• segment DB

• segment AB

• segement BC