4 1/2 inch
radius = 65/(2*pi) = 10.3450713 inches
20 inches will be the 'diameter' so the 'radius' will be 10 inches.
Radius of the circle: 3.65/2 = 1.825 inches
12 inches
A circle with a radius of 3.4 inches has a circumference of 21.36 inches.
6 inch or 4 inch if it's a short radius
Short Radius 90 degree elbows are the same as pipe size.... Long Radius 90's are pipe size times 1.5.... so a 6" (SR) elbow is 6"... a 6" (LR) elbow would be 9"
90 degree
In the area of industrial pipe fittings: Long radius 90 deg elbow has a take off dimension of one and one half times the nominal diameter of the pipe. Ex-4 inch pipe has an actual diameter of 4.5, for the elbow the take off dimension would be 4"*1.5=6". The short radius elbow take off dimension is the same as the nominal size, 4". To add to the point, a short radius elbow can be used typically where space is a constraint. Hence fluid flow is also restricted in this case unlike in case using of Long Elbow.
1/2 inch
39in.
4 inch 5d bend 45degree elbow center how much
2 inches
7/8 of an inch
12"
The take-off for a standard radius 90 is one and one half the diameter of the pipe. Example: 6 inch 90 has a take- off of 9 inches. The take-off for short radius 90 would be the dia. of the pipe. Long radius 90 is 2 times the pipe diameter.
If the leak is in Elbow better change it. For a short time you can use welding to seal. It depends on the medium, temperature and pressure critically