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.
if the roof of the house is 7 m 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 think you use the Pythagorean theorem. I got:
7sq = 3sq + b sq
49 = 9 + b sq
49-9=40
b = 40
after this I'm lost. what is the sq rt of 40? do I need to multiply this by 2?
pls help!!
Put this in the Google search window:
sqrt(40)
(Google has a nice calculator built in. No, don't multipy it by 2. You only do ones side at a time.
so, I got sqrt40 = 6.32
does that mean that each piece of insulation needs to be 6.32 m ?
yes, that is the length of the piece from the eave to the ridge.
yes, that is the length of the piece from the eave to the ridge.