Circles

Circle Terms

100

The distance from the center of a circle to the outside, also half of the diameter

What is radius

200

What is the line that goes through a circle, and through the mid point

 Diameter

300

Describe circumference

The distance around a circle

400

Describe area (of a circle)

The area inside a circle

500

What is the ratio of diameter to circumference more commonly know as?

Pi

Finding area or circumference(find the radius for all)

100

A circle has a diameter or 6, what is the area of the circle? Round to the nearest tenth if needed.

28.26 rounds to 28.3

200

What is the circumference of a circle with a radius of 8 inches?

50.24 inches

300

What is the area of a circle with a diameter of 9? Round to the nearest tenth if needed.

63.6 units squared

400

What is the circumference of a circle with a diameter of 27 cm?

84.78 cm

500

The radius of a circle is 4meters, find both the area and circumference

25.12 meters = circumference

50.24 meters squared = area

Surface area & volume

100

Find the surface area of a tablecloth that is 9 feet wide by 16 feet long.

144 square feet

200

What is the surface area of a cylinder that has a diameter of 4.6 and a height of 2.5? (Do not round during any of the stages)

Area of top and bottom circle = 16.6106 x 2 = 33.2212

C = 14.444

Area of "label" = 14.444 x 2.5 = 36.11

Total SA = 33.2212 + 36.11 = 69.3312

300

What is the area of only the label of a soup can that has a radius of 4, and a height of five?

c = 8 x 3.14 = 25.12

Area of label = 5 x 25.12 = 125.6

400

Mrs. Streich is wrapping a gift and wants to make sure she has enough wrapping paper. The box is 16 inches long, 9 inches wide, and 5 inches height. How much paper does she need?

288 +160 +90 = 538 square inches of paper

500

What is the volume of a cylinder with a radius of 20 inches and a height of 45 inches?

56,520 cubic inches

Potpourri

100

Explain how you can find diameter given the radius

Double it  (multiply it by 2)

200

How many degrees are in a circle?

360

300

Describe circumference in your own words

The distance around a circle, ...the perimeter of a circle..

400

What is the difference between area and surface area?

Area is for 2 dimensional figures, like a square or a circle. Surface area is the area of all the faces of a 3 dimensional object, like a box (rectangular prism) or a cylinder. 

500

If a pie graph shows that 42% of students' favorite class is social studies, what would the central angle be? 

Set up a proportion: 42/100 = x/360

151.2 degrees