Circles Pre Test

What is the formula for circumference of a circle? (There are 2 correct answers! You must select both.)

• C=2πr

• C=πr²

• C=r÷2

• C=πd

What would the radius of a circle be when the diameter is 20 ft?

• 60.3

• 23.14

• 10

Which of the following represents a major arc? Check all that apply

• arc ACE

• arc ABC

• arc BCE

• arc EA

Q1. What is the line that touches a curve at a single point called?

• A) secant

• B) chord

• C) tangent line

• D) diameter

Which line is a tangent line from the picture?

• DG

• JB

• CD

• HF

Solve for [x]. Assume that lines which appear tangent are tangent.

• 8

• 5

• 4

• 9

Find the m∠PQR

• 77˚

• 110˚

• 257˚

• 128˚

Arc AD = 19x-49 and Arc DC=5x+37. How would you set up an equation to find x?

What are the coordinates of the center and the radius of the circle with equation:
(x - 4)² + (y - 3)² = 25 ?

• Center (4,3)
  Radius = 5 units

• Center (4,3)
  Radius = 25 units

• Center (-4,-3)
  Radius = 25 units

• Center (-4,-3)
  Radius = 5 units

In the equation (x-3)²+(y+4)²=121, the radius of the circle is

• 242

• 11

• 121

• 22