7.9B 7.5B Circles STAAR Review

A circle has a radius of 10 inches. The circumference of the circle is c inches. Which expression best represents the value of π?

• 10c

• c/10

• c/20

• 20c

A group of students formed a circle during a game. The circumference of the circle was about 43.96 feet, and the diameter of the circle was 14 feet. Which expression best represents the value of π?

• 43.96/7

• 43.96/14

• 7/43.96

• 14/43.96

Tags

CCSS.7.G.B.4

A sundial has a circular base with a diameter of 90 feet. Which measurement is closest to the area of the circular base of the sundial in square feet?

• 3,627.5 ft²

• 282.6 ft²

• 141.3 ft²

• 6,358.5 ft²

Tags

CCSS.7.G.B.4

Which of these best describes π?

• The square root of the area of a circle

• The ratio of the radius of a circle to its diameter

• The radius of a circle times 3.14

• The ratio of the circumference of a circle to its diameter

Tags

CCSS.HSG.GMD.A.1

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

Tags

CCSS.7.G.B.4

The head of a nail is circular, as shown. The head of this nail has a diameter of 6 millimeters. Which measurement is closest to the area of the head of this nail in square millimeters?

• 9.42 mm²

• 113.04 mm²

• 28.26 mm²

• 37.68 mm²

Tags

CCSS.7.G.B.4

A circle has a radius of 4.5 centimeters. Which measurement is closest to the circumference of the circle in centimeters?

• 14.13 cm

• 28.26 cm

• 63.59 cm

• 56.52 cm

Tags

CCSS.7.G.B.4

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. 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

Tags

CCSS.7.G.B.4

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 ft²

• 50.24 ft²

• 200.96 ft²

• 803.84 ft²

Tags

CCSS.7.G.B.4

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

• 56.52 cm²

• 141.30 cm²

• 1,017.36 cm²

• 254.34 cm²

Tags

CCSS.7.G.B.4