Circumference, Diameter, Radius and Formulas

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

Tags

CCSS.HSG.C.A.2

CCSS.HSG.CO.A.1

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 π r
• c = π d
• C = π 2 d

Tags

CCSS.7.G.B.4

What is the formula for circumference of a circle given the radius?

• C = π r
• C = 2 π r
• C = π d
• C = π 2 d

Tags

CCSS.7.G.B.4

What is the diameter?

• 8 cm
• 16 cm
• 10 cm
• 4 cm

Tags

CCSS.7.G.B.4

What is the radius?

• 18 ft
• 72 ft
• 38 ft
• 14 ft

Tags

CCSS.7.G.B.4

What formula do you use to find the circumference of a circle when you are given radius.

• c=2 π r
• c=2πd
• c= I don't know
• None of the above

Tags

CCSS.7.G.B.4

What formula is used to find the circumference of a circle when you are given diameter.

• c = 2π
• c = r² ⋅ d
• c = π d
• None of the above

Tags

CCSS.7.G.B.4

What is the diameter of this circle?

• 3.5 m
• 3 m
• 5 m
• 7 m

Tags

CCSS.7.G.B.4

Daniel wants to buy cookies for her friend. The
radius of a cookie is 5 inches. What is the cookie’s 
circumference?

• 10 in
• 2.5 in
• 15.7 in
• 31.4 in 

Tags

CCSS.7.G.B.4