Area/circumference of circles part 1

The word "circle" is derived from which Greek words?

• 'hoop' or 'round'

• 'smooth' and 'round'

• 'round' or 'ring'

• 'hoop' or 'ring'

What is the middle point of a circle called?

• center

• midway

• middle

• midpoint

The diameter is _____ times the radius

• 3

• 4

• 2

• 5

the total distance all-round the outer line of a circle is the ___________

• area

• circumference

• length

• segment

The region bounded by the outer line of a circle is the _________

• area

• circumference

• length

• segment

If the radius is 2 inches how long is the diameter?

• 8

• 6

• 2

• 4

If the diameter is 12 inches long, how long is the radius?

• 18

• 3

• 6

• 24

What is the formula for area?

• A=PI(d)

• A=PI(r)^2

• A=2(PI)r

• A=r^2

What is the formula for circumference?

• C=2(PI)r or (PI)d

• C=(PI)r^2

• C=2r

• C=2r^2

What did the study of circles help mathematicians develop?

• Shapes and figures

• Calculus and anatomy

• Trigonometry and math

• Number and probability