SQRT[(x1 - x2)^2 + (y1 - y2)^2 + (z1 - z2)^2]

**Midpoint of a Line Segment:**

[(x1 + x2)/2, (y1 + y2)/2, (z1 + z2)/2]

For 2D applications, the Z terms drop out.

Circle: Circle Sector: Triangle: A = Pi*r^2 A = (1/2)*t*r^2 A = (1/2)*b*h C = 2*Pi*r s = r*t A = (1/2)*a*b*sin(t) For the triangle, a and b are 2 sides, t is the angle included between a and b. Sphere: Cone: Cylinder: V = (4/3)*Pi*r^3 V = (1/3)*b*h V = Pi*r^2*h A = 4*Pi*r^3 A = 2*Pi*r^2 + 2*Pi*r*hh is the distance from bottom to top, represented by a line perpendicular to the base. For the cylinder, the base and top must be parallel.

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This page was last updated created September 17, 1996.