Circles Unit Test

Name the diameter of the circle.

• DE

• BA

• BC

• DC

What kind of line is PR?

• Tangent

• Secant

• Chord

• Diameter

What is the center of this circle:
(x-5)² + (y+3)² = 16

• (5,-3)

• (-5,3)

• (5,3)

• (-3,5)

What is the radius of this circle:
(x-4)² + (y-5)² = 25

• 25

• 5

• -5

• 4

What is the standard equation of a circle?

• (x-k)² + (y-h)² = r²

• (x+h)² + (y+k)² = r²

• (x-h)² + (y-k)² = r²

• (k-x)² + (h-y)² = r²

Which equation matches the circle on the graph?

• x²+y²=16

• x²+y²=32

• 2x²+5y²=256

• 24x²+999y²=16

What is the radius of this circle?

• 18in

• 36in

• 9in

• 8in

What type of line is OK?

• diameter

• secant

• radius

• tangent

What is DG?

• Secant

• Radius

• Chord

• Tangent

Which is a chord?