Finding the radius of a corner?

The radius would be on the inside of a circle, the distance between the centre and any point on the outside. If you're measuring something on the outside of the circle then surely it's just a length?
 
Ice Rich said:
Hi all,

I am trying to work out the radius of a corner (belfast sink) so I can order a worktop with an accurate cut-out.

Looking at the site below:
http://www.propools.com/measure_radius.php

If the line drawn at point 'B' would continue until it touched the tip of the 'semicircle' would the radius be that size?

Many thanks,
Click to expand...

The lengths of line D or E are the radius, but only if the curved corner segment is exactly one quarter of a circle.
 
not like this?

radiusz.jpg
 
Okay. D and E form a right-angled Isosceles triangle. If you find the hypotenuse of this triangle then you can take the radius of the circle away from this to find the distance from B to the edge of the circle (which is what you want).

The radius of the circle will be equal to D and E. You can use Pythagoras to find the length of the hypotenuse.

E.g. If E and D are 10 and F is the length you want to find...

H^2 = E^2 + D^2
H^2 = 10^2 + 10^2
H^2 = 100 + 100
H^2 = 200
H = 14.142

Now,

F = H - F
F = 14.142 - 10

F = 4.142 - The distance from B to the circle's edge.
 
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