Angles: Estimate Angles 2: Circle Angle
More difficult. Click on the circle to start the ray in motion. Click on the circle again to stop the ray at the given angle. Points are given based on how near the ray was stopped to the given angle.
When students learn to use a protractor, they are sometimes confused by the two sets of numbers around its perimeter. Does the angle measure 130° or 50°? This confusion can usually be avoided by giving students experience in estimating angle measures. Anyone who has a good sense of what a 130°
angle looks like in all its possible orientations will never confuse it with a 50° angle! Here are some interactive sites that give students practice estimating angle measures.