Hope the ASCII art is legible...

.707"
|---|

/
/
/ 45 deg angle
/_______

|- 1" -|

The length of the diagonal line is 1".

The diagonal of a 1" square is 1.414"

--
JeffB
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David wrote:
I've got a board set at a 45 degree angle, back from a line. How much
(percentage) of the length of the board does it take up? To
conceptualize the issue, I drew a one inch line on paper with a ruler,
and rotated the ruler to a 45 degree angle, thinking that the one inch
mark on the ruler would be only 1/2 away from the starting point (along
the original path of the ruler), but it looks like it's about 90% along
the one inch span. What's the formula?

Dave