Vocabulary
A line that intersects a circle at exactly one place
Tangent
πr2
Area
Find the circumference of a circle with diameter=58m
182.21 m
Find the diameter if a circle with radius = 4.5in
9 in
Center: (-7, 3)
Radius: 5
(x+7)2+(y-3)2=25
An arc with a measure less than 180 degrees
Minor Arc
2πr
Circumference
Find the area of a circle with radius = 12 ft
452.39 ft2
Find the radius of a circle with diameter = 34 yd
17 yd
Center: (0, -4)
Radius: 8
x2+(y+4)2=64
A segment with endpoints on the circle
Chord
πd
Circumference
Find the circumference of a circle with radius = 7mm
43.98mm
Find the radius of a circle with area = 380.13in2
r = 11 in
Find the center and radius.
(x-1)2+(y-9)2=81
Center: (1, 9)
Radius: 9
An angle with a vertex at the center and two sides that are radii
2r
Diameter
Find the area of a circle with diameter = 18cm
254.47in2
Find the diameter of a circle with circumference = 65.97 m
d = 21 m
Find the center and radius.
(x+5)2+y2=100
Center: (-5, 0)
Radius: 10
An arc with endpoints on the diameter
Semicircle
(x-h)2 + (y-k)2=r2
equation of a circle
What is pi?
3.141592653...
What does area measure? What does circumference measure?
Inside of a circle, outside of a circle
Find the equation of the circle with center (2, -6) and point on the circle (1, 10)
(x-2)2+(y+6)2=257