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Circle Parts
Problems Using Triangle Relationships
Equation of a Circle
100

A line from the center of the circle to the edge 

Radius

100

Identify the measure of angle K

59 degrees

100

What is the standard form for the equation of a circle

(X-h)2 + (y -k)2 = r2

200

A line from one side of the circle to the other side, that goes through the center

Diameter

200

Identify the measure of angle L

91 degrees

200

Equation for finding a diameter

d=2r

300

 A section of the outside of the circle

Arc

300

Identify the measure of angle M

30 degrees

300

Equation for finding the radius of a circle

d/2=r

400

The distance around the outside of the circle

Circumference

400

What are the lengths of the sides of the triangle from smallest to largest

Small: Side KL

Middle: Side LM

Large: Side KM

400

Identify the center and radius of the circle for the following equation: 

(x-5)2 + (y-1)2 =64

Center: C (5, 1) 

Radius: R =8

500

A line that touches the circle at exactly one point

Tangent

500

Identify the center and radius of the circle for the following equation: 

(x+6)2 + (y+5)2 =16

Center: C (-6, -5) 

Radius: R=4