A rectangular room is 15 feet by 12 feet and has one 3-foot door opening. How many linear feet of baseboard are needed before waste?
Correct Answer
B) 51 linear feet.
Perimeter = 2 × (15 + 12) = 54 feet. Exclude the one 3-foot opening: 54 − 3 = 51 linear feet. The 54-foot choice fails to subtract the opening; 57 adds it. Subtracting the opening twice would give 48. This is installed length before cutting waste.
Why This Is the Correct Answer
Perimeter = 2 × (15 + 12) = 54 feet. Exclude the one 3-foot opening: 54 − 3 = 51 linear feet. The 54-foot choice fails to subtract the opening; 57 adds it. Subtracting the opening twice would give 48. This is installed length before cutting waste.
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