Exploring Area and Circumference of Circles

What is the radius of a circle?

• Perimeter of the circle

• Distance across the circle through the center

• Covering of the circle

• Distance from center to edge

How is Pi defined in relation to a circle?

• Circumference times radius

• Circumference divided by diameter

• Diameter divided by circumference

• Radius times diameter

Which formula can be used to find the circumference of a circle?

• Radius squared times Pi

• Pi divided by diameter

• 2 Pi times radius

• Pi times radius

What is the circumference of a circle with a diameter of 30 cm?

• 60 cm

• 45 cm

• 94.2 cm

• 15 cm

What formula is used to find the circumference if only the diameter is known?

• Diameter divided by Pi

• Pi times diameter

• Pi times radius squared

• 2 Pi times radius

How do you calculate the area of a circle?

• 2 times Pi times radius

• Pi times radius squared

• Pi times diameter squared

• Radius times diameter

What is the area of a circle with a radius of 8 mm?

• 201.06 mm squared

• 200.96 mm squared

• 64 mm squared

• 50 mm squared

If the radius of circle Y is 27 yards, what is the radius of circle X, given it's a third of circle Y?

• 27 yards

• 18 yards

• 9 yards

• 81 yards

What is the area of circle X with a radius of 9 yards?

• 254.34 yards squared

• 27 yards squared

• 81 yards squared

• 729 yards squared

What is the difference in circumference between circle A (diameter 10 feet) and circle B (diameter 12 feet)?

• 6.28 feet

• 2.28 feet

• 22.4 feet

• 5 feet