Unit 7 Review

Which formula best describes how to find C, circumference, when d, diameter is given?

• C = π + d
• A = πr²
• A = π x r x r
• C = πd

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 16ft. 
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

A group of students stood in a circle had a diameter of 30 meters. Which measurement is closest to the circumference of the circle in meters?

• 18.84 ft²
• 94.2 ft²
• 37.68 ft²

Landon used a quarter of a circle and rectangle to form the figure shown. 
Which is the best estimate of the area of the figure in square centimeters?

• 170 cm²
• 50.24 cm²
• 220.24 cm²
• 370.96 cm²

Which of the following formulas can be used to calculate the area of a circle when diameter is given?

• C = πd
• A = πd
• A = π(d/2)²
• A = r(d)

A teacher bought 2 liters of soda for her classroom celebration. There are approximately 29.6 milliliters in 1 fluid ounce. Which measurement is closest to the number of fluid ounces in 2 liters?

• 68 fl. oz.
• 100 fl. oz. 
• 200 fl. oz. 
• 35 fl. oz. 

Shown below are two sections of trapezoids and two sections of congruent right triangles. 
Which measurement is the best estimate of the area of the banner in square meters?6 m

• 6 m²
• 15 m²
• 8 m²
• 10 m²

The model below is a drawing of a living room that is in need of new carpet. 
The carpet will cost $2.50 a square foot. How much will it cost to lay down new carpet?

• $305
• $250
• $125
• $190

The diagram below shows the radius of the pumpkin pie. 
Which of the following is closest to the circumference of the pie in centimeters?

• 31.4 cm
• 3.14 cm
• 15.7 cm
• 78.5 cm

A chef uses a circular pan with a 24-inch diameter to make a pizza. What is the best estimate for the area of the pizza?

• 54.26 in²
• 38.9 in²
• 202.5 in²
• 452.16 in²