What is circle?
In terms of the plane, the circle is the area limited internally by a circle. Center, the radius of the circle is the center, the radius of the surrounding circle.
Calculate the area of a circle is to calculate the area inside the circle.
The pink part is the area of the circle
The area of a circle is calculated by the formula: Square radius of circle multiplied by Pi .
The formula for calculating the area of a circle
Inside:
+ r : Radius of a circle
+ π : Constant Pi (π = 3.14)
The formula for the area of a circle helps you calculate the total surface area inside the circle.
The circumference of a circle, also known as the length of a circle, is the boundary line separating the inside from the outside of the circle.
Circumference is the length of the circle
The circumference of the circle is calculated using the formula: Diameter multiplied by Pi or twice the radius multiplied by Pi .
Formula to calculate the circumference of a circle
In which :
+ r : Radius of a circle
+ d : Diameter of circle
+ π : Constant Pi (π = 3.14)
Because circles cannot be measured with a ruler, you can use the circumference of a circle to get the length of the circle.
A circular fan shape is a part of a circle limited by two radii and an arc shielded by these two radii.
The blue part is the circular fan-shaped area
The area of a round fan is calculated by the formula:
The formula for calculating the area of a round fan
In which :
+ r : Radius of a circle
+ π : Constant Pi (π = 3.14)
+ l : The length of the arc
The fan-shaped area formula makes it easy to calculate the area of the part of the plane inside the circle.
See also :
>>> Synthesize a table of full, detailed and easy-to-understand trigonometric formulas
>>> The formula for calculating the area of a trapezoid, trapezoidal perimeter fully understandable
Above are the formulas to calculate the perimeter, the area of a circle and the circle fan. Thank you for watching and see you in the following articles.
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