See www.learningviewer.com for more information.
The 180 Degree AngleViewer can help students:
• Measure obtuse or acute angles with a single color.
• Visualize supplementary angles with the use of two colors.
• Understand reflex angles.
• See angles in relationship to a 360° circle.
In addition:
• Opposite angles stand out as equal.
• Transparent colors enable easy use on an overhead projector.
• Retains angle measurement when moved. (less info)