Sine theorem a/sinA=b/sinB=c/sinC=2R? Note: where r represents the radius of the circumscribed circle of the 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 central coordinate.

General equation of a circle x2+y2+Dx+Ey+F=0 Note: D2+E2-4FO.

Parabolic standard equation y2=2px y2=-2px x2=2py x2=-2py

The side area of a straight prism is S=c*h, and the side area of an oblique prism is s = c * h.

Lateral area of a regular pyramid S= 1/2c*h lateral area of a regular prism S= 1/2(c+c

The lateral surface area of the frustum of a cone S = 1/2(c+c)l = pi(r+r)I The surface area of the sphere S=4pi*r2.

Lateral area of cylinder S=c*h=2pi*h lateral area of cone s =1/2 * c * l = pi * r * l.

The arc length formula l=a*r a is the radian number r0 of the central angle and the 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=SL Note: where s is the straight section area and l is the side length.

Cylinder volume formula V=s*h? Cylinder V=pi*r2h

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