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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.

Arc Width

Increments


Measure at scale Left click, release and drag to measure at scale in diagram.
Height

Radius

Sweep Angle °

Arc Area   ft²

Length around Arc

Full Circle Circumference

Full Circle Area   ft²
Scale
Height


Mark-out

To lay out a large radius arc in a confined area, enter either the maximum height of the arc (above centre of chord), or the radius of the arc, and the increments along the chord line for your lay out points.

The smaller the increments, the more accurate (and smooth) the arc line will be.

Mark the base 'chord' line and increments from centre 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.




Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

Open new window containing only diagram images in current page ↓ This will better fit printed page. Printing to Scale Help
Print all diagrams on current page

Use your iPad or Android Tablet On-Site Your iPad, iPhone or Android Tablet or Phone is a valuable On-Site tool!
Lay your phone or tablet on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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Greg Tarrant - blocklayer.com - ph: (Australia) +61 7 40987645 - mob: 0438 165 753

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ALWAYS CHECK WITH YOUR LOCAL BUILDING AUTHORITY BEFORE LAYING OUT OR BUILDING ANYTHING
AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION


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