Pi and Area

What is π ? (Best Choice)

• The ratio of the circumference of any circle to its diameter.
• Exactly 3.14
• Exactly 3.1415
• Exactly 3.141593

A Circle has a radius of 4.  What is the circumference of the circle? (Best Choice)

• 4π or about 12.56
• 16π or about 50.24
• 2π or about 6.28
• 8π or about 25.12

A Circle has a radius of 4.  What is the circumference of the circle? (Best Choice)

• 4π or about 12.56
• 16π or about 50.24
• 2π or about 6.28
• 8π or about 25.12

A Circle has a radius of 4.  What is the area of the circle? (Best Choice) (note: units are squared)

• 4π or about 12.56
• 16π or about 50.24
• 2π or about 6.28
• 8π or about 25.12

A Circle has a radius of 6 inches.  What is the circumference of the circle? (Best Choice)

• 3π or about 9.42 in
• 6π or about 18.84 in
• 12π or about 37.68 in
• 36π or about 113.04 in 

A Circle has a radius of 6 inches.  What is the area of the circle? (Best Choice)

• 3π or about 9.42 in²
• 6π or about 18.84 in²
• 12π or about 37.68 in²
• 36π or about 113.04 in² 

A Circle has a diameter of 10 centimeters.  What is the circumference of the circle? (Best Choice)

• 5π or about 15.7 cm
• 10π or about 31.4 cm
• 20π or about 62.8 cm
• 100π or about 314 cm 

A Circle has a diameter of 10 centimeters.  What is the area of the circle? (Best Choice)

• 5π or about 15.7 cm²
• 10π or about 31.4 cm²
• 25π or about 78.5 cm²
• 100π or about 314 cm² 

A Circle has a diameter of 18 meters.  What is the circumference of the circle? (Best Choice)

• 9π or about 28.26 m
• 18π or about 56.52 m
• 81π or about 254.34m
• 324π or about 1017.36 m 

A Circle has a radius of 12 inches.  What is the circumference of the circle? (Best Choice)

• 24π or about 75.36 in
• 12π or about 37.68 in
• 144π or about 452.16 in
• 576π or about 1,808.64 in