Area and Circumference of Circles

An observatory is shaped like a cylinder standing on one of its bases with a dome on top. The diameter of the floor of the observatory is 64 feet, as shown in the diagram.

Which measurement is closest to the circumference of the base of the observatory in feet?

• 200.96 ft

• 3,215.36 ft

• 100.48 ft

• 401.92 ft

A company's logo was designed using circles of 3 different sizes. The diameters of the two of the circles are shown.

Which measurement is closest to the area of the largest circle in square centimeters?

• 56.52 square centimeters

• 141.30 square centimeters

• 1,017.36 square centimeters

• 254.34 square centimeters

A circular tablecloth has a radius of 2.5 feet. Kyle is sewing a piece of ribbon around the edge of the tablecloth. If Kyle has exactly enough ribbon, which measurement is closest to the length of the piece of ribbon in feet?

• 7.85 ft

• 15.7 ft

• 19.63 ft

• 31.4 ft

A rotating lawn sprinkler sprays water in a circular area of grass, as shown in the picture. The diameter of the circular area of grass is 16 ft.

Which measurement is closest to the area in square feet that this sprinkler sprays with water?

• 100.48

• 50.24

• 200.96

• 803.84

A group of students stood in a circle to play a game. The circle had a diameter of 22 meters. Which measurement is closest to the circumference of the circle in meters?

• 34.54

• 1,519.76

• 379.94

• 69.08

A circular railroad-crossing sign has a diameter of 30 inches.

Which measurement is closest to the area of the sign in square inches?

• 94.2

• 188.4

• 706.5

• 286.6

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

Tags

CCSS.HSG.CO.A.1

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²
• 29.55 m²
• 30.36 m²
• 28.26 m²

Tags

CCSS.7.G.B.4

What is the area of this semicircle ?

• 100.48cm²

• 80cm²

• 200.96cm²

• none of the above

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft
• 12.25 ft
• 10.99 ft
• 8.75 ft

Tags

CCSS.7.G.B.4