SOLUTION: Word Problem: The insulation comes in 40cm wide rolls that are cut to fit between the rafters in the attic. The roof is 7m from peak to eave and the attic space is 3m high at the

Question 118406: Word Problem: The insulation comes in 40cm wide rolls that are cut to fit between the rafters in the attic. The roof is 7m from peak to eave and the attic space is 3m high at the peak, how long does each piece of insulation need to be? Round to the nearest tenth.
40^2=7^2+3^2
Am I using the right formula in order to solve this problem?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The insulation comes in 40cm wide rolls that are cut to fit between the rafters in the attic. The roof is 7m from peak to eave and the attic space is 3m high at the peak, how long does each piece of insulation need to be? Round to the nearest tenth.
:
you sort of have the right idea, however:
:
The width of the insulation (40 cm) has no bearing on the problem
:
The roof consists of two right triangles, back-to-back /|\.
:
We want to find the base of one of the triangles then double it
:
The height is given as 3 m "|"; call it b
The hypotenuse is given as 7 m; "/" or "\"; call it c
:
Find the base (a) using the pythagorean theorem: a^2 + b^2 = c^2
a^2 + 3^2 = 7^2
a^2 + 9 = 49
a^2 = 40 - 9
a^2 = 40
a =
a = 6.32455
double this:
12.6 meters is the length of the insulation
:
Did this help?

RELATED QUESTIONS
Please assist me with this problem. All I need is the formula I can work the problem.... (answered by stanbon)

Okay, the following question has me stumped, Geometry: If the roof of a home is 7m from... (answered by checkley75)

a homeowner wishes to insulate her attic with fiberglass insulation to conserve energy.... (answered by scott8148)

Solve. A homeowner wishes to insulate her attic with fiberglass insulation to conserve (answered by solver91311)

Solve. A homeowner wishes to insulate her attic with fiberglass insulation to conserve (answered by stanbon)

A homeowner wishes to insulate her attic with fibergrlass insulation to conserve energy.... (answered by checkley71)

I've tried to find these two questions and can't seem to find them. I tried to register... (answered by stanbon)

homeowner wishes to insulate her attice with fiberglass insulation to conserve energy.... (answered by checkley71)

I can't seem to figure out the formula for the following word question. Can you assist? A (answered by bucky)