Lay Out a Large Arc in a Confined Space with No Access to Circle Center
If you're laying out a large radius arc in a confined area and can't reach the center of the circle, enter arc dimensions below to find lay-out points in the curve.
Also see Printable Arc Templates to create printable paper templates for smaller arcs.
Left click, release and drag to measure at scale in diagram.
Arc Width
Increment
Offset
Height
Radius
Sweep Angle °
Arc Area ft²
Length around Arc
Full Circle Circumference
Full Circle Area ft²
Height
Increment
Scale
Inside Arc (right side bottom of diagram)
Mark-out
Outside Arc (left side top of diagram)
Mark-out
To lay out a large radius arc in a confined area, enter either the maximum height of the arc (above center of chord), or the radius of the arc,
and the increment along the chord line for your lay out points.
The smaller the increment, the more accurate (and smooth) the arc line will be.
Mark the base 'chord' line and increments from center outwards, and measure 90 ° to the arc points to form the arc.
To make sure the measured points are square
off the base line, mark another line parallel to the base line (above or below), square a line through the center, mark corresponding increments and line through
both increment marks to mark the arc points.
Calculate Arc Height and Width From Radius and Sweep Angle
Radius
Sweep Angle °
If you know the Radius of your arc, and the Sweep Angle, and need to find the Height and Width to draw the template, enter Radius and Sweep Angle and hit
Calculate Height to calculate the height and width of the arc. Enter the Height and Width (Chord) above to draw the arc template.
Sweep°
Radius
Scale
If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
How should we spell it?
Results
What do we think? - They're 2 different things:
A Meter is a device to measure things - like a Volt Meter or a Parking Meter
A Metre is about 3'-3~3/8"
Although diameter and perimeter as measurements - don't seem to fit very well
If the US ever goes Metric, you'll be able to use a Meter to measure Meters - A Meter Meter
(And when we go back to the moon, let's go Metric, ay?)
All Inch inputs and dimensions are actual physical finished sizes(unless otherwise noted)
All Metric Inputs in Millimetres(unless otherwise noted)
Left click, release and drag to measure at scale in diagram.
If you're cutting blocks, concrete, stone or 
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