7.9B Circles

A circle has a diameter of 7.6 feet. Which measurement is closest to the circumference of the circle in feet?

• 23.9 ft

• 45.3 ft

• 47.7 ft

• 11.9 ft

The diameter of circle x is 15 centimeters. The diameter of circle y is 20 centimeters. Which measurement is closest to the difference between the circumference of circle x and the circumference of circle y in centimeters?

• 15.7 cm

• 7.85 cm

• 137 cm

• 31.4 cm

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 circular railroad-crossing sign has a diameter of 30 inches. Which measurement is the closest to the area of the sign in square inches?

A company's logo was designed using circles of 3 different sizes. The diameter of the two circles are shown. Which measurement is closest to the area of the largest circle in square centimeters?

An observatory is shaped like a cylinder standing on one of its bases with a dome top. The diameter of the floor is 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

The circular opening of a tunnel has a circumference of 36 meters. Which equation can be used to find d, the diameter of the tunnel opening in meters?

A stereo speaker in the shape of a triangular pyramid has a height of 6 inches. The area of the base of the speaker is 11 square inches. What is the volume of the speaker in cubic inches?

A ring toss toy is composed of a rectangular prism on top of a cylinder. The rectangular prism is completely filled with water. The dimensions of the rectangular prism are shown in the diagram. What is the volume of the rectangular prism in cubic centimeters?

• 26 cubic centimeters

• 270 cubic centimeters

• 165 cubic centimeters

• 348 cubic centimeters