Circle Review

a straight line from the center to the circumference of a circle or space

• Diameter

• Chord

• Radius

• Tangent

a straight line passing from side to side through the center of a body or figure, especially a circle or sphere

• Diameter

• Chord

• Secant

• Tangent

What is the radius of a circle when the diameter is 70 m?

• 38

• 35

• 90

• 140

The diameter of a circle is:

• The measurement around the circle.
• The distance from an edge of a circle to another edge.
• The distance from the center of the circle to an edge of a circle
• The distance from an edge of a circle to another edge through the center. 

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Is this Radius or Diameter?

• Radius

• Diameter

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

The number pi is approximately equal to _________. 

• 3.14
• 3
• whatever the diameter equals 

Find the area of the circle

• 56.52
• 254.34
• 1017.36
• 113.04