COMMON CONVERSIONS1. To convert square inches to square feet, dividesquare inches by 144.2. To convert square feet to square inches, multiplyby 144.3. To convert square feet to square yards, divide by9.4. To convert square yards to square feet, multiplyby 9.5. To convert square feet to squares, divide by 100.Example:1.2.3.4.Convert 1,550 square inches into square feet.Convert 15 square feet to square inches.Convert 100 square feet to square yards.Convert 10.3 square yards to square feet.10.3 square yards x 9 square feet= 92.7 square feet5. Convert 17,250 square feet to squares.AREA OF A CIRCLEDevelopment of Formula:The above demonstrates that a circle divided into anumber of parts maybe laid out as a parallelogram. Asthe number of parts is increased, the longer side ap-proaches 1/2 of the circumference; if divided into anindefinite number of parts, it would be equal to 1/2 thecircumference. As the number increases, h approachesr and would be equal if the circle was divided into aninfinite number of parts.The areas of the parallelogram isThe formula for the area of a circleSince r = cY2 where d is the diameter of a circle, theformula for the area of a circle in terms of its diameterisGEOMETRIC SOLIDSIn describing plane shapes, you use only two dimen-sions: width and length; there is no thickness. By addingthe third dimension, you describe a solid object.Consider the solids shown below.AII-17

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