https://www.ecalculator.co/calc/sector-area-calculator
The formula for the sector area is simple: multiply the central angle with the square radius and divide by 2: sector area = r² * α / 2.
Following is the formula for calculating the area of a sector:
Where:
A = area per sector
π = 3.141592654
r = circle radius
θ = middle angle in degrees
Instructions for using the sector calculator area
The calculator is not difficult to use. If you are not sure what a sector is, see my sector lessons in the Website Geometry section
Insert the radius of the circle
Enter the size of the angle between the fingers
Then click the Calculate button
Don't enter slashes (/)! If you do this, wrong answers will be counted
Therefore, convert all fractions to decimal places before entering numbers
Enter all numbers without units. For example, if r = 5 cm, enter 5.
Enter a positive number less than or equal to 360 for the angle