6.MG.1 Circles Practice Test and Review

Which is NOT a representation of pi?

• 3.14

Match the following circle parts.

• chord

• radius

• diameter

• center

Pi is the ratio of ​ (a)   to ​ (b)  

• circumference
• diameter
• radius
• area

The distance around a circle is the ​ (a)  

The space inside a circle is the ​ (b)  

• circumference
• area
• radius
• diameter
• pi

A circle has a radius of 6 m. What is the diameter of the same circle? Just type the number.

Mathematical Equivalence

ON

A circle has a diameter of 9 in. What is the radius of the same circle? Just type the number.

Mathematical Equivalence

ON

A circular garden has a radius of 2 meters. What is the diameter and approximate circumference of the garden, in meters?

• diameter: 4

  circumference: 12.56

• diameter: 4

  circumference: 6.28

• diameter: 2

  circumference: 12.56

• diameter: 2

  circumference: 6.28

A circular garden has a diameter of 20 meters. The circumference of the garden is 62.8 meters. What is the ratio of the circumference of the garden to its diameter?

• 0.3184

• 1.57

• 3.14

• 6.28

In the circle shown, the circumference of the circle is 62.8 cm. What representation would be an approximation for pi? Hint- remember what the ratio of pi is!

Heather was asked to draw the human eye and then calculate the radius of the iris. After the drawing was complete, the radius was 0.39 cm. What is the circumference of the iris in Heather's drawing, rounded to the nearest hundredth?

• 2.91 cm

• 2.45 cm

• 1.62 cm

• 1.25 cm