MON_315 Circle Review

MON_315 Circle Review

Be sure to have your toolbox out and doing these problems on paper

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Formulas

Radius

 $r=\frac{d}{2}=\frac{1}{2}d$  
Diameter
 $d=2r$  
Circumference
 $C\ =\ 2\cdot r\cdot\pi\ =\ d\cdot\pi$  

Find the missing information

Given the radius is 10 miles, what is the diameter?

 $d=2\cdot r=2\cdot10=20$  miles

Given the radius is 10 miles, what is the circumference?

 $c\ =\ 2\cdot r\cdot\pi\ =2\cdot10\cdot\pi=20\pi$  miles

Multiple Choice

Given a radius of 44 meters, what is the diameter?

• 22 meters

• 44 meters

• $44\pi$

• 88 meters

Multiple Choice

Given a diameter of 72 inches, what is the circumference?

• 72 inches

• $72\pi$ inches

• 36 inches

• $36\pi$ inches

Multiple Choice

If you have a radius of 27.5 feet, what is your circumference?

• 55 feet

• $55\pi\$ feet

• $27.5\pi$ feet

• $13.75\pi$ feet

Multiple Select

Check the two measurements that are true if the circumference is

 $60\pi$  centimeters (cm)

• radius = 30 cm

• radius = 60 cm

• diameter = $30\pi$ cm

• diameter = 60 cm

Two step equations

CREATE BALANCE LINE AT = EQUAL SIGN =

Step 1

Add or Subtract

Step 2

Make CoefficIent 1

Multiply or Divide

Multiple Choice

Solve for d

 $25=10d-9$  

• d=10

• d=34

• d=340

• d=3.4