The additions to the van Hiele level indicators (Scally, 1990) are presented divided into five sections: drawing angles, identifying angles, sorting angles,

angle measure, and angle relations.

The objective of this study was to assess

angle measure reproducibility between manual tracing and that obtained with Cephapoint on a digital image.

The

angle measure between each pair of chords is listed below the pair.

Comparison--the method of comparing of the

angle measures of tested instrument with the ones provided by the reference means of angle measurement [5-6].

In the next section, we present the visual aids to help students visualise the geometry of the Earth, followed by the instruction concerning

angle measure, which is the foundation for the instruction in the remaining sections.

The precision electrogoniometer has a manufacturer-reported accuracy of 0.017[degrees] and is considered the criterion standard for validity testing of lumbar region

angle measures. The rigid arms on the instrumented trunk were secured to the tracks on the table and moveable cradle of the passive movement device.

This system uses such concepts as angles, sides,

angle measure, length, congruence, and parallelism to describe and analyze spatial relationships in and among shapes.

An interesting activity for children who know about

angle measure is to figure out the measure of the angles in each of the seven pieces without using a protractor.

The final conversation, about

angle measure, shows the students' discussing mathematical ideas without the teacher's orchestrating the conversation.

The program would interest those who teach with Logo as an introduction to the language, those who wish to "do a little Logo," or those who wish to teach ideas of rotation and

angle measure, spatial sense, two-dimensional figures, geometric motions, and more - even if no Logo instruction was planned.

The software also includes dynamic measuring tools for length,

angle measure, and area.

The UVLED's spectral bandwidth at 50 per cent is 12nm (typical); the half-intensity beam

angle measures 9[degrees].