 Substitute the values.  Follow the order of operations. (GPRMDAS)  Use appropriate units. ◦ Perimeter is measured in units. (n units) ◦ Area is measured.

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Presentation transcript:

 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)

l = 20 in w = 12 in V = 1440 in³ V = lwh 1440 = 20(12)h 1440 = 240h = h l = 20 in w = 12 in V = 1440 in³ V = l w h 1440 = h 1440 = 240 h = h h = 6 in

l = 20 in w = 12 in h = 6 in SA p = 2(lw + wh + lh) = 2(20∙ ∙6 + 20∙6) = 2( ) =2( ) =2( ) =2(432) =864 in² 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 = = = = 864 in²