The surface area of a rectangular prism is 442 square feet. The length is 11 feet, and the height is 8 feet. What is the width o f the prism? I need an explanation please on how to work this problem.
2 answers:
There are 6 surfaces on a rectangular prism . 3 pairs of equal area. Surface area 2wl + 2hw + 2 hl where h = height, w = width, l = length. So inserting the given values:- 442 = 2*w*11 + 2 *8* w + 2*8*11 442 = 22w + 16w + 176 38w = 442-176 = 266 w = 7 width = 7 feet
Formula for the surface area of a rectangular prism is S=2ab + 2bc + 2ac (a-lenght,b-width,c-height). We need to calculate b (width). S=442 ft^2 a=11 ft c=8ft ------------------ b=? S=2ab + 2bc + 2ac S=2b(a+c) + 2ac 2b(a+c)=S - 2ac b=(S - 2ac)/(2(a+c)) b=(442 - 2×11×8)/(2×(11+8)) b=(442 - 176)/(2×19) b=266/38 b=7 ft
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