Essential Math Formulas Comprehensive Guide for Quick Reference and Exam Prep

Essential Math Formulas: Comprehensive Guide for Quick Reference and Exam Prep Diameter squared x .7854 - Area of a circle Diameter squared x .7854x L - Volume of a cylinder Pi(3.1416)x Diameter - Circumference of circle Half the diameter D/2 - Radius of a circle LxWxH - Cubic content of square or rectangular box Height in ft x .434 - Psi base of water column (H x .434) + 2lbs - Air pressure to lift sewage Psi x 2.31 - Height of water column 2.31 - Number of ft to exert 1 psi Area x psi or (Diameter squared in inchs x .7854) x (H in feet x .434) - Total pressure at base of water column 43,560 square ft - How many square ft per acre Diameter squared in inch x Length in ft x .0408 - Gals in cylinderical tank (water heater) L"xW"xH"/231 - Cap in Gals of square or rectangular tank in cubic inch L'xW'xH' x 7.5 - Cap in gals of square or rectangular tank in cubic Ft 1 cubic ft = how many gals - 7.5 gals in how many cubic ft 1 gal = how many cubic inch - 231 cubic inchs = how many gals 1 square ft = how many square inchs - 144 sq inchs = how many square ft 1 cubic ft = how many cubic inchs - 1728 cubic inchs = how many cubic ft 8.33 lbs - weight of one gal of water 62.5 lbs - weight of one cubic ft of water 3.1416 - Pi = 144 sq inch = what precent of a 1" square taken by a circle - .7854= how many sq inchs capacity in gals of pipes and tanks - .0408 would be put into what equation .0408 - D2" x L'x___ 7.5 - L'xW'xH'x___ 231 - L"xW"xH"/___ .434 - H'x___ .7854, .434 - (D2"x___) or area x (H'x___) or psi .7854 - D2x___xL