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Basic Formulas
Areas of polygons
Circumference and Arc Length
AREAS IN CIRCLES!
Areas of Sectors
100
The formula for the area of a polygon
What is 1/2aP
100
The formula to find the central angle in a regular polygon.
360/# of sides
100
Formula for finding the circumference
2*pi*radius or pi*diameter
100
the radius to the diameter of a circle
half of it
100
the formula for area of a sector
What is (measure of the arc/360)(pi*r squared)
200
What is the area of a circle?
pi*r^2
200
A pentagon has a side length of 8 inches and an apothem of 5.506 inches. What is the area of the pentagon to the nearest hundredeth?
What is 110.12 inches squared.
200
Formula for arc length
arc length= (angle measure/360)*circumference
200
A Circle has a radius of 22.3 inches. What is its area?
What is 1562.28 inches squared.
200
The Measure of an arc is 60 degrees, the diameter of the circle is 10 inches. Find the area of the sector. (round to the nearest 10th)
13.1 in^2
300
What is the formula for area of a triangle?
(1/2)*b*h
300
What is the area of a hexagon with a radius of 10cm and a side length of 10cm? (Round to the nearest 10th of a cm)
259.8 cm^2
300
What is the radius of a circle that has a circumference of 63 ft? (Round to the nearest hundredth of a foot)
10.03 ft
300
The area of a circle is 231.04 pi, find it's radius.
What is 15.2
300
The radius of a circle is 8 meters, the measure of the arc is 55 degrees. Find the area of the sector in terms of pi.
What is 88/9 pi, or 9.7 pi
400
What is the formula for area of a kite?
(1/2)*diagonal1*diagonal2
400
What is the area of a square with a radius of 14 in?
392 in^2
400
What is the measure of an arc that has a length of 8.73 in and a radius of 10 in?
50 degrees
400
The circumfrence of a circle is 24pi, what is the area of the circle?
What is 144 pi, or 452.39
400
The diameter of a circle is 14 inches. find the area of the sector if the measure of the arc is 270 degrees.
What is 115.45 inches squared.
500
Formula for area of a trapezoid?
(1/2)*h*(base1+base2)
500
What is the area of an octagon with a radius 8.4 mm and an apothem of 8 mm? (Round to the nearest 10th of a mm)
163.9 mm^2
500
What is the length of an arc that has a radius of 8 ft and a measure of 60 degrees? (Round to the nearest tenth of a foot)
8.4 ft
500
The area of a circle with a radius of 9 that does not include the area of a concentric circle with a radius of 5
56*pi or 175.93 units^2
500
The area of a sector created by a 89 degree angle is 12.36 m^2. What is the length of the radius?(round to the nearest meter)
4 meters