Circle

What do you call the enclosed boundary of a circle? (labelled C)

• pi

• radius

• diameter

• circumference

What do you call a line from the centre to the circumference? (labelled R)

• pi

• radius

• diameter

• circumference

What do you call a line passing from side to side through the centre? (labelled D)

• pi

• radius

• diameter

• circumference

What do we call 3.14159265...?

• pi

• radius

• diameter

• centre

What is the value of pi?

• pi

• 3.14

• 3.14159265...

What is the symbol of pi?

• pi

• 3.14

• 3.14159265

• π

What is pi?

• an irrational number that gives the ratio of the circumference of a circle to its

  diameter

• the diameter of a circle

• the radius of a circle

What do you call the middle of a circle? (labelled O)

• pi

• radius

• diameter

• origin

A circle with a diameter of a has a radius of...

• 4a

• a/2

• π

• 2a

A circle with a diameter of 7cm has a radius of...

• 50mm

• 14cm

• 3.5cm

• 200mm