Benchmark #2 Review 2

Benchmark #2 Review 2

Units 3 and 4

Parts of a Circle

• Radius: line segment that goes from the center to the edge of the circle (HALF the DIAMETER)

• Diameter: line segment that goes from edge to edge on a circle (TWICE the RADIUS)

• Circumference: the distance around the outside of a circle (AKA perimeter)

Circumference

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• C = πd

• Circumference is a little more than 3 times the diameter

Multiple Choice

A cruise ship has a large, circular window with a diameter of 6 meters. Approximately what is the window's circumference?

• 18 meters

• 12 meters

• 19 meters

• 6 meters

Multiple Choice

The radius of the circle is 9 meters. What is the circle's circumference?

• 56.52 m

• 28.26 m

• 18 m

What is Pi?

• the ratio of the circumference to the diameter of a circle (π= c/d)

• a greek symbol (π)

• approximately 3.14

• used when solving area and circumference of circles

Multiple Select

What is pi?

Check ALL applicable answers!

• a delicious dessert

• the ratio between circumference and diameter

• a Greek symbol

• exactly 3.14

• approximately 3.14

Multiple Choice

Serena drew a circle with a circumference of 157 centimeters. The diameter is 50 cm. What is the best approximation of $$\pi$$  ?

• $$\frac{50}{157}$$  

• $$\frac{157}{50}$$  

• $$\frac{157}{25}$$  

• $$\frac{157}{100}$$  

Area

• the measure inside the circle

• always in square units

• A = π r²

Multiple Choice

What is the area of this circle?

• 28.26 cm²

• 28.26 cm

• 9.42 cm²

• 9.42 cm

Multiple Choice

What is the area of this circle? Round to the nearest tenths place.

• 452.2 cm²

• 113.1 cm²

• 37.7 cm²

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Percent Increase

• Amount goes UP

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Percent Decr​ease

• ​Amount goes DOWN

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Calculating Percentages​

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Multiple Choice

Your friend Alex had a dog named Spot that used to weigh 150 pounds. Alex didn’t buy enough dog food one week and started to feed the dog people’s food, such as lasagna. Spot gained 12% of his body weight that week. How much does Spot weigh now?

• 162 pounds

• 1,250 pounds

• 18 pounds

• 168 pounds

Multiple Choice

If a water tank that could hold 45 gallons of water is replaced by a tank that can hold 25% more, what is the capacity of the new tank?

• 11.25 gallons

• 70 gallons

• 56.25 gallons

• 33.75 gallons

• Taxes

• Tips

• Mark-ups

• Interest​

Things that INCREASE COST

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• Discounts

• Mark-downs

Things that DECREASE COST

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Multiple Choice

Find the total cost.  Dinner with tax included is $23.77; you leave a 10% tip.

• $ 2.38
• $ 2.37
• $ 26.15
• $ 21.39

Multiple Choice

What is the total price of a book if Barnes and Nobles gets it for $4.25 and the markup is 30%?

• $55.25
• $1.28
• $5.53
• $4.38