1, circle volume = 4/3 (pi) (r 3) area = (pi) (r 2) perimeter = 2(pi)r The standard equation of a circle (x-a)2+(y-b)2=r2(ab) is the general equation x2+y2 of the center coordinate circle. 0 ellipse circumference formula: 1=2mb+4(a-b)

2. ellipse circumference's theorem: the circumference of an ellipse is equal to the short axis of an ellipse, and the circumference of a circle with a radius of (2mb) plus the difference between the long axis (a) and the short axis (b) of an ellipse four times. Elliptic area formula: s=ab.

3. Ellipse area theorem: the area of an ellipse is equal to π(t) multiplied by the product of the major semi-axis length (a) and the minor semi-axis length (b) of the ellipse. Although there is no ellipse πT in the above ellipse circumference sum area formula, both formulas are derived from ellipse π t. ..

Mathematics [English: Mathematics, from ancient Greece μ? θξμα(máthēma)； Often abbreviated as math or maths], it is a discipline that studies concepts such as quantity, structure, change, space and information.

Mathematics is a universal means for human beings to strictly describe and deduce the abstract structure and mode of things, and can be applied to any problem in the real world. All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics.

Mathematics plays an irreplaceable role in the development of human history and social life, and it is also an indispensable basic tool for studying and studying modern science and technology.