Geometry Mid-Chapter Circles

1)  Which of the following lines are considered the radii? Only one correct answer. 

• PR
• PT
• QS
• RS

To find the perimeter of a semi-circle, you must:

• Find the circumference and divide by 2
• Find the circumference and divide by 2 and add the diameter
• You can’t find the perimeter of circles
• Find the circumference and multiply by 2

1)  The formula for finding the circumference of a circle is

• C = 2(pi)(radius) 
• C = 2 (pi)
• C = Pi(pi)
• C = diameter times radius

1)  Circumference is

• The distance across the circle
•  distance around the circle
• The length of the diameter times the radius

Identify the correct relationship between radius and diameter

• d = 2r
• r = 2d
• C = pi times d
• There is not relationship

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

An arc is...

• A line that passes through the center and goes from edge to edge.
• A part of the circumference.
• A boat.
• A line that touches the circle once.

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. 

Point C is...

• On the circle
• Outside the circle
• Inside the circle
• Between B and D

A tangent line of a circle is...

• It's diameter
• It's radius
• It's circumference
• A line that touches the circle only once