Area of circle: y= τ r2, sector area: s= 1/2*l*r, and calculation formula of arc length: l = τ r/ 180.
Cylinder volume: S =σR2 * h, cone volume 1/3σR2 * h,
Sphere volume = (4/3) π (r 3)
Sine theorem a/sinA=b/sinB=c/sinC=2R Note: where r represents the radius of the circumscribed circle of a triangle.
Cosine Theorem b2=a2+c2-2accosB Note: Angle B is the included angle between side A and side C..
The standard equation of a circle (x-a)2+(y-b)2=r2 Note: (A, B) is the center coordinate.
General equation of circle x2+y2+Dx+Ey+F=0 Note: D2+E2-4f > 0
Parabolic standard equation y2=2px y2=-2px x2=2py x2=-2py
The basic equation of quadratic function y = ax2+bx+c (c >; O) root judgment formula △ t = B2-4ac
The linear function y = kx+b (b >; o)
Inverse proportional function y = k/x.