Area and circumference of circles

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

Tags

CCSS.HSG.GMD.A.1

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

Tags

CCSS.7.G.B.4

what is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

Tags

CCSS.7.G.B.4

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

• 31.25 m²
• 29.55 m²
• 30.36 m²
• 28.26 m²

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

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

• Diameter
• Radius

Tags

CCSS.7.G.B.4

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

• Radius
• Diameter

Tags

CCSS.7.G.B.4

 What are the formulas for circumference of a circle?

• C = π r

• C = π d

• C = 2 π r

• C = 2 π d

Tags

CCSS.7.G.B.4

How do you find the area of a circle?

• $\pi d^2$

• $2\pi r$

• $2\pi^2$

• $\pi r^2$

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

Find the area of this Semicircle with a diameter of 18 cm

• 254.34 cm
• 127.17 cm
• 56.52 cm
• 28.26 cm

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

Find the perimeter of the semicircular region. Round your answer to the nearest hundredth.

• 23.13 m

• 28.26 m

• 14.13 m

• 56.52 m

Tags

CCSS.3.MD.D.8