if the roof 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.
2007-03-07 01:13:19 · 4 answers · asked by DEE L 2 in Science & Mathematics ➔ Engineering
You're looking at a right-angle triangle.
The hypoteneuse is the roof length (from peak to eave) = 7 m.
The vertical side is attic height = 3 m.
Therefore insulation (which lies on the horizontal side of the triangle) would be:
SQRT (7*7 - 3*3) = SQRT (40) = 6.3246 m
(6.3 m to nearest tenth).
Since the roof is actually TWICE that width (remember, you looked at a distance at the midpoint of the roof to obtain the attic height!), the length of material to cover the entire width of the roof in one 'swath' would be 2 x 6.3 = 12.6 m.
Remember to leave a hole for access to the attic, though ...
2007-03-07 04:27:48 · answer #1 · answered by CanTexan 6 · 0⤊ 0⤋
take the square root of (7*7 + 3*3) to get 7.6 m
2007-03-07 09:19:51 · answer #2 · answered by Mark M 2 · 0⤊ 0⤋
bout that long........go to Walmart in the tools section and buy one of those calculators there that does all the figuring for you. otherwise what is it.....a2+b2=c2? paper and pencil helps
2007-03-07 09:25:49 · answer #3 · answered by Jedi 7 · 0⤊ 0⤋
rounded it will get you 8m
2007-03-07 09:22:17 · answer #4 · answered by Vlado 4 · 0⤊ 0⤋