Parts of a Circle (Vocab)
Area & Circumference
Sector Area & Arc Length
Equations of a Circle
No Calc Math
100
This is a segment with endpoints at the center and on the circle.
Radius
100
What are both of the formulas for circumference?
C=2pir
C=pid
100
(The dotted arc). Round to the nearest tenths place.
24.4
100
Write an equation: Center: (4,5) Radius = 3
(x - 4)2 + (y - 5)2 = 9
100
704 - 395
309
200
An arc with a measure less that 180 degrees. We use two letters to name it.
Minor Arc
200
What is the circumference of a circle whose radius is 8? Round to the tenths.
50.2
200
(The shaded sector). Round to the nearest tenths place.
143.2
200
Write an equation: Center (-3, 8) Radius = 13
(x + 3)2 + (y - 8)2 = 169
200
FREE POINTS!
Nice.
300
FREE POINTS!
Nice.
300
What is the area of a circle whose radius is 9.5? Round to the hundredths.
283.39
300
Round to the nearest tenths place.
13.1
300
What is the center and radius of:
(x - 9)2 + y2 = 25
Center: (9, 0)
Radius: 5
300
1/3 + 1/4
7/12
400
True or False: A diameter is a chord.
True
400
What is the area of a circle whose diameter is 20? Round to nearest whole number.
314
400
Round to the nearest tenths.
4.2
400
Write an equation: Center (0, 0) Diameter = 18
x2 + y2 = 81
400
822 / 3
274
500
An angle with a vertex at the center and the two sides are radii.
Central Angle
500
A circle's circumference is 56 in. What is it's radius? Use 3.14 for pi. Round to tenths place.
r = 8.9
500
Round to the nearest tenths.
31.4
500
Write an equation: Center: (-5, 7) radius:
sqrt12
(x + 5)2 + (y - 7)2 = 12
500
68 * 14
952