Area Calculator: Combining polygon zones and holes — Worked Scenario

What this scenario actually checks

Choose a shape and enter the dimensions marked on its diagram. Add or subtract rectangles, triangles, circles and L shapes. For irregular spaces, enter directions and lengths to draw exact edges, or drag template corners with labelled grid snapping.

This walkthrough focuses on combining polygon zones and holes. It follows the published tool inputs, not a new formula or an automatically verified legal, financial, medical or engineering determination.

Start by preparing the right inputs

Choose metres, centimetres or millimetres, then follow the A/B/C/D diagram. Circles use the diameter; triangles use a base and its perpendicular height. Add a section for another space or subtract a section for a void. New sections start empty. Areas are converted to square metres and summed; square feet are shown too.

Before copying the example, confirm that each entered unit, date, dimension and default matches your real task. Changing only a visible number without revisiting its assumptions can change what the answer means.

• Choose metres, centimetres or millimetres, then follow the A/B/C/D diagram. Circles use the diameter; triangles use a base and its perpendicular height.
• Add a section for another space or subtract a section for a void. New sections start empty. Areas are converted to square metres and summed; square feet are shown too.
• For polygons, enter a direction and length for each edge. Right 10 m, down 8 m, left 10 m, then close gives 80 m². Typed lengths ignore mouse snapping. Alternatively, drag a template’s round corners. Edge labels are metres. Tap the first corner or Finish polygon to close the shape.

Worked example with the calculator

Use the following input values: 10×8 m rectangle minus a 2×2 m void.

The example output is 80 − 4 = 76 m². Enter width A=10 and height B=8 in metres, then subtract a 2×2 m section.

For comparison, the same tool also documents these inputs: Circle with diameter 2,000 mm. Its result is Approximately 3.142 m². Choose mm, select Circle and enter diameter A=2000. The radius is 1 m, so the area is π×1².

What can change the answer

For polygons, enter a direction and length for each edge. Right 10 m, down 8 m, left 10 m, then close gives 80 m². Typed lengths ignore mouse snapping. Alternatively, drag a template’s round corners. Edge labels are metres. Tap the first corner or Finish polygon to close the shape. Each grid cell defaults to 1 m. Choose 0.1, 0.5, 1, 2 or 5 m. With snapping enabled, new points and dragged corners align to that spacing. The initial canvas is 30×18 m and expands to fit typed dimensions. When zoomed out, the caption distinguishes visible grid cells from the snap interval. Easy mode assumes sections do not overlap. Drawing mode rejects crossing or overlapping shapes and requires excluded regions to stay inside an added shape.

Can I enter a radius for a circle? The field expects the diameter. Double a known radius first: a 1 m radius means a 2 m diameter.

Does changing grid spacing change existing areas? No. The spacing affects new points and future vertex movement. Turn snapping off to enter arbitrary precise coordinates.

Before using the result for a real decision

For combining polygon zones and holes, check the original measurements and input units, and save the assumptions alongside any number you share.

Where legal rules, official allowances, equipment ratings or contractual conditions matter, consult their current authoritative documents. An illustrative estimate is not a substitute for that verification.

• Reproduce the example before changing inputs
• Check all units and assumptions, including any default values
• Verify official or manufacturer-specific requirements outside the calculator