Compass — Grade 7 Accelerated, what it means and where it is taught

Tools for drawing exact circles and lines — no measuring allowed.

Taught in Grade 7 Accelerated.

Where it is taught

Practise this idea

1 question in the course bank use Compass, in Geometric Construction.

Problem 1

When bisecting an angle with a compass, why must the compass width stay the same for the two final arcs?

  1. So the drawing looks neat
  2. So the crossing point is the same distance from both sides
  3. So the arcs fit on the page
  4. It does not actually matter
Worked answer

So the crossing point is the same distance from both sides

Equal radii put the crossing point the same distance from each side of the angle.

A point equidistant from both sides lies exactly on the bisector — that is what makes the construction a proof, not a guess.

Elsewhere

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