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Applying Formulas

Applying Formulas. Substitute the values. Follow the order of operations. (GPRMDAS) Use appropriate units. Perimeter is measured in units. (n units) Area is measured in square units. (n units ² ) Volume is measured in cubic units. (n units ³ ).

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Applying Formulas

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  1. Applying Formulas

  2. Substitute the values. • Follow the order of operations. (GPRMDAS) • Use appropriate units. • Perimeter is measured in units. (n units) • Area is measured in square units. (n units² ) • Volume is measured in cubic units. (n units³)

  3. A rectangular prism has a length of 20 inches and a width of 12 inches. If its volume is 1440 cubic inches, what is the height? l = 20 in w = 12 in V = 1440 in³ V = l • w • h 1440 = 20 • 12 • h 1440 = 240 • h 1440 = 240 • h 240 240 6 = h h = 6 in l = 20 in w = 12 in V = 1440 in³ V = lwh 1440 = 20(12)h 1440 = 240h 1440 = 240h 240 240 6 = h

  4. A rectangular prism has a length of 20 inches, a width of 12 inches and a height of 6 inches. What is the prism’s surface area? l = 20 in w = 12 in h = 6 in SA sum of areas of all faces lw = 20(12) = 240 in² wh =12(6) = 72 in² hl = 6(20) = 120 in² SA = 240 + 240 + 72 + 72 + 120 + 120 = 480 + 144 + 240 = 720 +144 = 864 in² l = 20 in w = 12 in h = 6 in SAp = 2(lw + wh + lh) = 2(20∙12 + 12∙6 + 20∙6) = 2(240 + 72 + 120) =2(240 + 120 +72) =2(360 + 72) =2(432) =864 in²

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