Area and Circumference STAAR Review

The mean radius of Earth is 6,371.0 kilometers and the mean radius of Earth’s Moon is 1,737.5 kilometers. What is the approximate difference in the mean circumferences of Earth and Earth’s Moon? Round your answer to the nearest tenth of a kilometer. 

• 40,009.9 kilometers
• 29,098.4 kilometers
• 14,556.6 kilometers
• 10,911.5 kilometers

 What is the circumference of a circle with a radius of 4 inches? Use 3.14 for π.

• 12.56 inches
• 25.12 inches
• 50.24 inches
• 2.55 inches

 A school’s art teacher designs a circular flower bed inside a rectangular sandbox. The sandbox is 6 feet wide and 10 feet long. 
How many square feet will there be for sand after the flower bed is installed? Use 3.14 for π.

• 22 square feet
• 28 square feet
• 32 square feet
• 41 square feet

 Shawn is placing a fence around a circular garden with a 15-foot diameter. How many feet of fencing will Shawn need to buy to enclose the garden? Use 3.14 for π. Round UP to the nearest foot (you may have to buy more to fence the whole thing). 

• 47 feet
• 48 feet 
• 177 feet 
• 707 feet 

Here is a picture of a Ferris wheel. It has a diameter of 80 meters.How far does a rider travel in three complete rotations around the Ferris wheel?

• 753.6 meters
• 251.2 meters
• 125.6 meters
• 376.8 meters

The diameter of a bike wheel is 27 inches. If the wheel makes 15 complete rotations, how far does the bike travel?

• 1,271 inches 
• 405 inches
• 85 inches 
• 6,075 inches

A circular kitchen table has a diameter of 60 inches. How much fabric is needed to cover the table top?

• 2,826 square inches
• 188 square inches
• 11,304 square inches
• 1,147 square inches

Leiko lays a rectangular piece of construction paper on her desk. The construction paper is 16 centimeters long and 8 centimeters wide. She is able to cut two congruent circles from the construction paper as shown. After Leiko cuts the circles, approximately how many square centimeters of construction paper will she have left over? (Use 3.14 as an approximation of pi.)

• 27.52 square centimeters
• 50.24 square centimeters
• 77.76 square centimeters
• 100.48 square centimeters

The radius of the center circle on a soccer field is 10 yards. What are the circumference ( C ) and the area ( A ) of the center circle in yards?Please round answers to the nearest whole numbers and use 3.14 for 

• c = 31 yd ; a = 986 square yards
• c = 63 yd ; a = 314 square yards
• c = 31 inches ; a = 986 square inches
• c = 63 inches ; a = 314 square inches

The courtyard outside East Middle School is in the shape of a rectangle and half-circle. What is the circumference of the courtyard?

• 328.5 meters
• 407 meters
• 500 meters
• 7,850 meters