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.

Yes, that is correct. Each piece of insulation needs to be 6.32 meters long. This is the length of the piece from the eave to the ridge.