A rectangle field has its length 3 times as its width. If its area is 243 sq. m. Find its perimeter?
Answer: 72 m
Explanation
Let's denote the width as w.
Given the length is 3 times the width:
Length = 3w
Area = Length × Width
243 = 3w × w
243 = 3w^2
Dividing both sides by 3:
w^2 = 81
w = 9
Length = 3w = 3 × 9 = 27
Perimeter = 2(Length + Width)
= 2(27 + 9)
= 2 × 36
= 72
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