SOLUTION: 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 att

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Question 106215: 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 foof is 7m from peak to eave and the attic space is 3 m high at the peak, how long does each of the pieces of insulation need to be? Round to the nearest tenth.
I have a migraine from this one...thanks!
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the rafters, roof, and attic height form a right triangle ... let x=rafter

x^2=(7^2)-(3^2)

the x value is for one side of the attic so it is half of the insulation length