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| Math Central | Quandaries & Queries |
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Question from Scott, a student: A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm-wide rolls that are cut to fit between the rafters in the attic. If the roof is 6 m from peak to eave and the attic space is 2 m high at the peak, how long does each of the pieces of insulation need to be? Round to the nearest tenth. |
Scott,
She wants to put insulation above the ceiling of the rooms below to insulate the living space from the attic.
Each piece of insulation needs to be twice the length |QR|. The length |QR| you can find using Pythagoras theorem.
Harley
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