Ellipse circumference formula: L=2πb+4(a-b)
Ellipse circumference's Theorem: The circumference of an ellipse is equal to the circumference (2πb) of an ellipse with the radius of the short semi-axis length plus four times the difference between the long semi-axis length (a) and the short semi-axis length (b) of an ellipse.
Elliptic area calculation formula
Elliptic area formula: S=πab
Ellipse area theorem: the area of an ellipse is equal to π times the product of the major semi-axis length (a) and the minor semi-axis length (b) of an ellipse.
Although there is no ellipse πT in the above formula of ellipse circumference sum area, these two formulas are all derived from ellipse πT .. Constant is the body, so it can be used.
Formula for calculating the volume of an elliptical object Long radius * Short radius * Height of the ellipse
The arc length formula l=a*r a is the radian number r > of the central angle; 0 sector area formula s= 1/2*l*r
Conical volume formula V= 1/3*S*H Conical volume formula V= 1/3*pi*r2h
Oblique prism volume V=S'L Note: where s' is the straight cross-sectional area and l is the side length.
Cylinder volume formula V=s*h cylinder V=pi*r2h
Graphic perimeter area volume formula
The circumference of a rectangle = (length+width) ×2
Circumference of a square = side length ×4
Area of rectangle = length × width
Area of a square = side length × side length
Area of triangle
Given that the base of a triangle is h, then S=ah/2.
Given three sides A, B, C and half circumference P of a triangle, then S= √[p(p-a)(p-b)(p-c)] (Helen's formula) (p=(a+b+c)/2).
And: (a+b+c)*(a+b-c)* 1/4.