Circumference of Circles

There are 2 fomulas for the circumfernce of a circle, one is:

•  $C=2\pi r$ 

•  $C=\pi r$ 

•  $C=\pi r^2$ 

Tags

CCSS.7.G.B.4

There are 2 fomulas for the circumfernce of a circle, one is:

• $C=2\pi d$

• $C=\pi d$

• $C=\pi r^2$

Tags

CCSS.7.G.B.4

What is information is needed to calculate the circumference of a circle?

• a proper equation

• pi button and the radius or diameter

• radius or diameter and percent

Tags

CCSS.7.G.B.4

What is the correct setup to find the circumference of the circle above?

•  $C=2\pi\left(10\right)$ 

•  $C=2\pi\left(10^2\right)$ 

•  $A=2\pi\left(20\right)$ 

Tags

CCSS.7.G.B.4

What is the correct set up to find the circumference of the circle?

• $C\ =\ \pi\ \left(20\right)$

• $C\ =\ 2\pi\left(20\right)$

• $C\ =\ 2\pi\left(10\right)^2$

Tags

CCSS.7.G.B.4

What is the circumference of the circle?

Pi button, rounded to nearest whole #

• 44

• 22

• 88

Tags

CCSS.7.G.B.4

What is the are the circumference of a circle with a radius of 12 cm?

PI button, nearest hundredths

• 452.39

• 114.14

• 75.40

Tags

CCSS.7.G.B.4

What is the circumference of this circle?

Pi button, nearest whole #

• 50

• 25

• 125

Tags

CCSS.7.G.B.4

If a circle has a radius of 15, what is the length of the diameter?

• 47

• 7.5

• 30

Tags

CCSS.7.G.B.4

What is the radius, if a diameter is 18?

• 36

• 9

• 57

Tags

CCSS.7.G.B.4