Circles and Scale

What is Pi?

• A ratio of the circumference to the diameter of a circle

• A yummy dessert!

• A ratio of the diameter to the circumference of a circle

• Diameter times 2

If the circumference of a circle was C cm and the diameter was 13 cm, what expression best represents the value of Pi?

• C/6.5=3.14

• 6.5/C=3.14

• C/13=3.14

• 13/C=3.14

Some kids were standing in a circle. If the circumference of the circle was 43.96 feet, and the diameter was 14ft, what expression best represents the value of Pi?

• 43.96/7

• 43.96/28

• 43.96/14

• 14/43.96

If 2 inches represents 30 feet, What is the height of the scale model if the actual height is 180ft

• 3 inches

• 105 inches

• 12 inches

• 60 inches

If the big circle has a circumference of 44, and the small has one of 11, what is the diameter of the small circle?

• 3.5

• 7

• 22

• 88

What measure goes all the way across the circle, passing through the middle?

• A radius

• The circumference

• The diameter

• Pi

If the radius of a circle is 10, what is the diameter?

• 5

• 100

• 20

• 30

If the diameter of a circle is 9cm, what is the radius?

• 4.5 cm

• 27 cm

• 18 cm

• 30 cm

A map scale is 1in:50miles. Two cities are 450 miles apart. How far apart are the cities on the map?

• 9 inches

• 22,500 inches

• 450 inches

• 15 inches

What is the value of Pi?

• about 3.14

• about 22/7

• Both the first and second answer

• Neither answer are correct