The Pythagorean theorem: The sum of the
areas of the two squares on the legs (a and b) equals the area of the
square on the hypotenuse (c).The theorem is as follows:
In any right triangle, the area of the square whose side is the
hypotenuse (the side opposite the right angle) is equal to the sum of
the areas of the squares whose sides are the two legs (the two sides
that meet at a right angle).
The square on the hypotenuse is equal to the sum of the squares on the
other two sides.
If we let c be the length of the hypotenuse and a and b be the lengths
of the other two sides, the theorem can be expressed as the equation
A multiplied times A + B multiplied times B = C
multiplied times C
Example: The stair riser A is 7 inches and the stair tread is 10
inches.
7 x 7 = 49 + 10 x 10 = 100
Next Step 49 + 100 = 149 Next Step
You will need to find the square root
| of 149. On your calculator it will be a symbol that
looks like this
 |
Next Step Enter 149 into the calculator and press the square root
symbol and the answer should be 12.20655
C would equal 12 and 1/4 inches. Now just multiply 12.2 times the
number of steps or treads to get the length of the stair stringer.
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