# Mathematical Equations

• To find the circumference of a circle, multiply the diameter by 3.1416
• To find the diameter of a circle, multiply the circumference by .31831
• To find the area of a circle, multiply the square of the diameter by .7854
• To find the area of a rectangle, multiply the length by the width.
• To find the area of a triangle, multiply the base by 1/2 the perpendicular height.
• To find the area of an ellipse, multiply the product of both diameters by .7854
• To find the area of a parallelogram, multiply the base by the altitude.
• To find the side of an inscribed square, multiply the diameter by .7071 or multiply the circumference by .2251 or divide the circumference by 4.4428
• To find the side of an inscribed cube, multiply the radius of the sphere by 1.1547
• To find the side of a square of equal area of a circle, multiply the diameter by .8862
• To find the surface of a sphere, square the diameter and multiply by 3.1416
• To find the volume of a sphere, cube the diameter and multiply by .5236
• A side of a square multiplied by 1.4142 equals the diameter of it’s circumscribing circle.
• The side of a square multiplied by 1.128 equals the diameter of a circle of equal area.
• To find the gallon capacity of a tank (given the dimensions of the cylinder in inches), square the diameter of the cylinder the multiply by the length and by .0034

Manufactured in the USA by G&G Manufacturing Company.