Area of a Circle

Which of these do I need to find the area of a circle?

• Diameter

• Circumference

• Radius

Tags

CCSS.7.G.B.4

Which of these is the correct formula for the AREA of a circle?

• $\Pi d$

• $2\Pi r$

• $\Pi r^2$

Tags

CCSS.7.G.B.4

What is the area of a circle with a radius of 13km?  $A=\Pi r^2$  

• 81.64 km^2

• 530.66 km^2

• 40.82 km^2

• 507 km^2

Tags

CCSS.7.G.B.4

What is the area of a circle with a radius of 4cm?  $A=\Pi r^2$  

• 50.24 cm^2

• 25.12 cm^2

• 16 cm^2

• 12.56 cm^2

Tags

CCSS.7.G.B.4

What is the area of a circle with a radius of 9km?  $A=\Pi r^2$  

• 81 km^2

• 28.26 km^2

• 254.34 km^2

• 56.52 km^2

Tags

CCSS.7.G.B.4

What is the area of a circle with a diameter of 14cm? *HINT* Remember that you need the radius...not diameter to solve for area  $A=\Pi r^2$  

• 615.44 cm^2

• 153.86 cm^2

• 87.92 cm^2

• 43.96 cm^2

Tags

CCSS.7.G.B.4

What is the area of a circle with a diameter of 12mm? *HINT* Remember that you need the radius...not diameter to solve for area $A=\Pi r^2$

• 113.04 mm^2

• 452.16 mm^2

• 37.68 mm^2

• 75.36 mm^2

Tags

CCSS.7.G.B.4

What is the area of a circle with a diameter of 2mm? *HINT* Remember that you need the radius...not diameter to solve for area $A=\Pi r^2$

• 6.28 mm^2

• 314 mm^2

• 31.4 mm^2

• 3.14 mm^2

Tags

CCSS.7.G.B.4