All calculations are rounded off to 4 significant figures
I've never heard the term "rad-5"? You probably mean "radical 5", or the square root of 5, which is approx 2.236.
The sine of 60 degrees equals approx 0.8660.
4/radical 5 = 1.789 (approx)
2/radical 5 = 0.8944 (approx)
By "rad" do you mean "radian"? A radian is a unit of angular measure equal to approximately 57.30 degrees. there are pi radians in 180 degrees, 2pi radians in a complete circle.
A radian is that length of the circumference of a circle equal in length to the radius of the circle. So if you have a circle of radius 1 foot, and you cut out a 1 radian piece out of the circumference, that piece will also be a foot long after you straighten it out.
A good way to think about radians is "how much fencing does it take to enclose a circular corral of radius R meters?" Answer: 2 x pi x R meters of fence, or about 6.283 x R meters. How long is exactly 1 radian of fence: Answer: R meters.
Degrees were invented by the Babylonians because they thought the year was exactly 360 days long. Radians are the logical unit to measure angles with.
Off Topic » in reply to I used geometry, not trig...
What is "rad-5"?
The whole thread (37 posts)
- Question: how do you find 3 points on a plywood circle 120 degrees apart, without a protractor? (n/t)
- Without a template, you put your anchor bolts in. Drill out the plate.
- Yet another method
- Here you go, have a protractor:
- If I remember enough geometry...
- Cut a circle out of paper, exactly the same size as your plywood circle
- Yes, there is a way!
- So... tell us what you're building! (n/t)
- Why can't you use a protractor?
- It's impossible