Answer: The dimensions are: " 1.5 mi. × ³⁄₁₀ mi. " .
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{ length = 1.5 mi. ; width = ³⁄₁₀ mi. } .
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Explanation:
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Area of a rectangle:
A = L w ;
in which: A = Area = (9/20) mi.² ,
L = Length = ?
w = width = (1/5)L = (L/5) = ?
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A = L w ; we want to find the dimensions; that is, the values for
"Length (L)" and "width (w)" ;
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Plug in our given values:
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(9/20) mi.² = L (L/5) ; in which: "w = L/5" ;
→ (9/20) = (L/1) (L/5) = (LL)/(15) = L² / 5 ;
↔ L² / 5 = 9/20 ;
→ (L² ? / 5 ?) = 9/20 ?
→ 20÷5 = 4 ; so; L² 4 = 9 ;
↔ 4 L² = 9 ;
→ Divide EACH side of the equation by "4" ;
→ (4 L²) / 4 = 9/4 ;
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to get: → L² = 9/4 ;
Take the POSITIVE square root of each side of the equation; to isolate "L" on one side of the equation; and to solve for "L" ;
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→ ⁺√(L²) = ⁺√(9/4) ;
→ L = (√9) / (√4) ;
→ L = 3/2 ;
→ w = L/5 = (3/2) ÷ 5 = 3/2 ÷ (5/1) = (3/2) (1/5) = (31)/(25) = 3/10;
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Let us check our answers:
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(3/2 mi.) (3/10 mi.) =? (9/20) mi.² ??
→ (3/2)mi. (3/10)mi. = (33)/(2*10) mi.² = 9/20 mi.² ! Yes!
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So the dimensions are:
Length = (3/2) mi. ; write as: 1.5 mi.
width = ³⁄₁₀ mi.
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or; write as: " 1.5 mi. × ³⁄₁₀ mi. " .
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