Vocab
Central Angles
Arc Length
Sector Area
Circ & Area
Regular Polygons
100
The term used for distance around a circle.
What is Circumference?
100
Angle measure of a full circle.
What is 360 degrees?
100
What proportion can you use to solve for arc length?
Central angle / 360 = arc length/circumference
100
Central Angle:60
Radius:8
Calculate the area of the sector.
33.5 units2
100
What is the formula for circumference?
pi x diameter
πd
100
What is the apothem?
4.8 cm
200
A portion of the circumference of a circle.
What is Arc Length?
200
Angle measure of half a circle
What is 180o
200
Central Angle:60
Radius:12
Calculate the Arc Length
60 / 360 = x / 75.4
12.57 units
200
Central Angle:120
Radius:9
Calculate the area of the sector
84.8 units2
200
What is the formula for the area of a circle?
200
What is the perimeter?
46.2 m
300
A portion of the area of a circle.
What is a Sector?
300
If the measurement of the arc is 45o, what is the measurement of it's central angle?
What is 45 degrees?
300
Central Angle: 50
Diameter: 10
Calculate the Arc Length
50 / 360 = x / 31.42
4.36 units
300
Central Angle: 65
Diameter: 26
Calculate the area of the sector
95.86 units2
300
If a circle has a diameter of 17m what is the radius of the circle?
8.5 m
300
What is the area? (HINT: 1/2san)
1/2 (9.9)(10)(7.9)
391.05 ft2
400
The angle created when two radii meet at the center of a circle.
What is Central Angle?
400
If the measure of the central angle is 80o, what is the measurement of the arc?
What is 80 degrees?
400
Central Angle: 36
Radius:12
Calculate the Arc Length
36 / 360 = x / 75.4
7.53 units
400
Radius of 1.5
Central Angle: 270
Calculate the area of the sector
5.3 units2
400
Find the exact area of a circle with a diameter of 8m.
16 π m2
400
What is the area?
695.29 units2