Queen Plastic Protractor 1001, 180 Degrees, Clear

Queen Plastic Protractor 1001, 180 Degrees, Clear.

A protractor measures and sets angles — the semicircular 180-degree form for most work, the full 360-degree circle where you need to lay out angles in any direction from a centre point.

Line the baseline up on the line you are measuring from and put the centre mark exactly on the vertex — most protractor errors come from the centre being a millimetre out, not from misreading the scale.

• 180-degree for most work, 360-degree for full layouts
• Centre mark exactly on the vertex — that is where errors start
• Clear plastic so you can see the lines underneath