Problem 15 of 34geo-015
Dana fences a rectangular garden 20 feet long and 12 feet wide, leaving a 4-foot opening for a gate. Fencing costs $6 per foot. What is the total cost of the fencing?
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Solution walkthrough1:26
- A fence runs along the edge of the garden, so we need the distance around it: the perimeter.
- A rectangle has two lengths and two widths: feet around.
- The 4-foot gate opening has no fence, so take it off: feet of fencing.
- Each foot costs $6, so feet cost dollars.
- Traps: $384 forgets the gate, $168 counts only two sides, and $1,440 uses the area.