RACHII GEOMETRY

Support and help

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Version 1.1: tap the globe in the top toolbar to choose a language or use your device language.

Menus and help change immediately. Your worksheet names, point names and text stay as you wrote them.

01 · Place the compass

Choose Compass. Tap the canvas or drag the orange needle to set the center. Drag the green tip to adjust the radius.

02 · Lock and rotate

Tap the lock on the compass to fix its radius. Drag the green tip around the needle to draw an arc. Lift your finger or Pencil to finish, or choose Draw full circle.

03 · Transfer a distance

With the radius locked, move the needle to another point. The radius stays the same, useful for copying lengths and constructing equilateral triangles.

04 · Draw lines and notes

Ruler: drag the middle to move, or an end to rotate or change length, then draw along its edge. You can also tap two canvas points. Pen: drag to write. Select: tap and drag objects. Use two fingers to pan or zoom.

05 · Combine tools

Place a ruler or set square, then select Pen. Start drawing near an edge to follow it automatically. Other instruments stay on the canvas. Put each away using its × button above the canvas.

06 · Measure angles and add figures

Place the protractor center on the vertex. Rotate the blue handle to align the baseline with the first side, then move the green handle to the second side. Open the figure library to add figures and custom angles.

07 · Select, edit and erase

Drag a box around objects, or enable Multiple and tap to add selections. Drag a selected object to move the group. Change colors or delete using the bar above the canvas. Points can be renamed. Rub with the eraser to remove only the touched area.

08 · Worksheets

Every fresh launch starts with a blank canvas. Previous work is in All worksheets. Move worksheets to Trash with the trash button and restore them from Trash.

09 · Review each step

Tap a construction step to show the objects up to that step. Choose Back to editing when ready. Objects move independently; this app does not maintain dynamic geometry constraints.

Keep your work with you

Worksheets are saved on your device. Export PDF/PNG or an editable .rachiigeo backup. Canvas units are abstract units, not physical centimetres.

10 · Toggle tools and resize

Tap a tool to activate it; tap the active tool again to turn it off, including Select. Other placed tools remain. Select figures and drag the green corner to scale proportionally, or use the −/＋ magnifier buttons, even with several figures. On the compass, tap the line button for solid/dashed lines and the arrows to swap the needle and drawing tip.

Support enquiries

nopponidc@gmail.com

Rachii Geometry — App Store