Formulas
Definitions
Problems 1
Problems 2
100
Formula for Area of a circle
pi*r2
100
Definition of a Circumference
Measure of the distance around the circle.
100
31.42 in
100
Find the Radius
Area = 4572 cm
38.15 cm
200
Formula for the Arc Length of a circle
Arc Measure/360*2*pi*r
200
Definition of Arc Length
The distance around an arc
200
(2,4) - Center
8 - Radius
Complete the equation
(x- _)2+(y- _)2= ?
(x-2)2+(y-4)2=64
200
Equations of circles by completing the square
Find the center and radius
x2+y2+16x-14y+49=0
Center - (-8,7)
Radius - 64
300
Formula for Diameter of a circle
d=2r
300
Chord
A segment whose end points are on the circle
300
(x+4)2+(y-8)=400
Center = ?
Radius = ?
Center (-2,8)
Radius: 20
300
Write the equation
Center: (-4,8)
Radius: 5
(x+4)2+(y-8)2=25
400
Formula for Radius of a circle
r=d/2
400
Secant
Line that intersects a circle at 2 points
400
Find the arc length
8.73 cm
400
Find the sector area
39.5 cm
500
Formula for Sector Area of a circle
Arc Measure/360 * pi * r2
500
Radius
Distance from the center of the circle to the point of the circle
500
Find the Sector Area
113.1 in
500
Find radius A=5678
r = 42.5