# Help calculating lengths after angle cuts

 Forum topic by Adrian A posted 08-31-2013 03:30 AM 713 views 1 time favorited 4 replies
 Adrian A153 posts in 1560 days 08-31-2013 03:30 AM So if my piece is 1.5”wide then I cut an angle at the degrees shown how do I find out the length of ”?” Also how bout if I do it backwards. If I know ”?” Is 1.5” how do I find out what the other is? I don’t want to find out but trial and error or cut and check.

## 4 replies so far

 darinS384 posts in 1525 days #1 posted 08-31-2013 03:52 AM ? = 3 inches 1.5 divided by the sine of 30 degrees. If you know ?, then multiply it by the sine of 30 degrees. Hope this makes sense. If not, shoot me a PM and I will try to explain it further. -- If at first you don't succeed, skydiving is not for you! Picklehead580 posts in 587 days #2 posted 08-31-2013 10:59 AM Google “sohcahtoa”. Oh no!!! I swore I would never use my 8th grade geometry!!!!!!!! -- You've got to be smarter than the tree. jackthelab306 posts in 1351 days #3 posted 08-31-2013 11:28 AM Hey the simplest way is to draw the format out on a piece of cardboard and take the measurement. -- Dave in Minnesota - If it ain't broke, improve it! MrFid529 posts in 562 days #4 posted 08-31-2013 12:12 PM Automatically favorited and when I get to teaching this in geometry this year, you know I’m showing this to my class. Darin is correct, by the way. To do it backwards, switch 1.5 and ? in the equation I provided. I’ll leave the rest as homework. -- Bailey F - Eastern Mass.

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