GEOMETRIC AREA FORMULAS by J.D. Crouch 74166.305@COMPUSERVE.COM (using BASIC language symbols) A=Area B=Base H=Height R=Radius S=Side PI=3.14159 Triangle: B * H / 2 Square: S * S Rectangle: S1 * S2 Parallelogram: B * H Regular Pentagon: 1.720 * S * S Regular Hexagon: 2.598 * S * S Regular Octagon: 4.828 * S * S Circle area: PI * R * R Circle circumference: 2 * PI * R Ring: PI * ((R2 * R2) - (R1 * R1)) Ellipse: PI * R1 * R2 Sphere area: 4 * PI * R * R Sphere volume: (4/3) * PI * R * R * R Cone volume: PI * R * R * H / 3 Cylinder volume: PI * R * R * H
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