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i use a compound slide miter saw with a carbide tip blade IF YOU DON'T HAVE A COMPOUND MITRE SAW, OR IF YOU DON'T WANT TO TRASH YOUR BLADE BY CUTTING ALUMINUM WITH IT, YOU CAN CUT THEM BY HAND USING A HACKSAW. YOU WILL NEED TO MAKE A 45 DEGREE ANGLE MARK WITH A PENCIL. USE A SPEED SQUARE/RAFTER SQUARE IF YOU HAVE ONE. THIS CUT DOES NOT HAVE TO BE AS PRECISE AS IF YOU WERE DOING BASEBOARDS IN YOUR HOUSE, THERE'S ROOM FOR SLIGHT ERROR HERE AS THE MITRE STRAP THAT GOES AROUND THE JOINT WILL COVER MINOR FLAWS IN THE CUT. CUTTING WITH A HACKSAW WORKS FINE.
This question is unclear.You could be asking for the square root of ( c5 )or alternatively for ( the square root of c )5Also are you intending for c to be as in the speed of light - if not, why not use x?
The question must 1st be asked is "what spacing do you plan to use?" Local codes will apply of course. Up North spacing is closer than that of the South because of snow loads. 16 inches on center is a good number to use. You said rafters but I wonder if you meant trusses. Another problem with answering the question is the roof design. For a ranch style house you would simply multiply the length in feet by 3 and then divide that by 4 and add one for the end this will give you the number of trusses you need. For rafters you need to multiply your number by 2 and add 4 for the barge rafters.
A framing square is used to cut stairs, rafters, or anything else requiring repeated cuts that are square or of a given angle. How do you use it? Depends on what you are doing. Cutting stairs? You figure out the height and distance out you want the stairs to go and dedide on how high you want the steps. Steps can be anything , but usually between 5 to 8 inches high and 8 to `12 inches wide. Most common is 8x10 8 high and 10 wide. Take the square on the edge of a 2x12. put the 8 inch mark on the left hand side and the 10 inch on the right side. Using the top edge of the square. Mark this L on the board and then move down the board putting the 8 inch where the 10 inch was. Mark the top edge again, repeat until you have made a long enough stair. The measurements can be anything so that you end up with even steps.. It can be 6 and 3/8 inches by 11 and a half inches if that makes for even steps. Laying it out it should look like a series of L's running the length of the 2x12. Cut out the 3 cornered pieces and you have a stair riser.
To cut plexiglass you should use a handsaw and make sure it is a handsaw that can cut in straight lines. You should also measure out how you much you need and what shape you need.