4.G.1. Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in twodimensional figures.
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Not Right For WatchKnowLearn
Ages: 9  18
9987 Views:

This video podcast explains angle measurement and benchmark angles. (04:09)
January 19, 2011 at 09:17 PM


Not Right For WatchKnowLearn
Ages: 9  14
9400 Views:

To a rocking tune of Old McDonald Had a Farm, this video features students singing a simple song that teaches acute, obtuse, and right angles. Students form the angles with their hands. (01:04)
July 10, 2009 at 02:35 PM


Not Right For WatchKnowLearn
Ages: 10  15
3346 Views:

The instructor uses an electronic sketchpad to demonstrate how to constucut angles. Video discusses vocabulary and symbols associated with angles, ray (sides of the angle), vertex (the point where the rays start). It then goes on to use the protrac...tor to measure an angle. It starts with where to put one line of the angle and then where and what to measure. It also instructs students which set of numbers to use on a protractor. Then examples are measured. Good video for instruction and review for any grade level. (06:19)
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July 13, 2009 at 06:46 PM


Not Right For WatchKnowLearn
Ages: 5  8
3003 Views:

Learn about rectangles, parallelograms, right angles and polygons. Use parallel segments to make a rectangular tree house.
June 16, 2012 at 10:57 PM


Not Right For WatchKnowLearn
Ages: 8  13
16227 Views:

This oneminute video is from The Math Party National Standards Program and features a catchy tune to help students remember lines, rays, line segments, and planes. (01:07)
August 20, 2009 at 04:21 PM


Not Right For WatchKnowLearn
Ages: 10  16
3538 Views:

This Power Point presentation demonstrates how to name quadrilaterals and discusses the sides and angles of quadrilateral. The definition of a quadrilateral is stated as "the only polygon for which the opposite sides and opposite angles are defined"....
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March 27, 2010 at 03:23 PM


Not Right For WatchKnowLearn
Ages: 7  13
3428 Views:

This twominute video, set to song, may help students learn the types of angles; acute, right, obtuse, etc. (01:50)
August 14, 2011 at 01:23 PM


Not Right For WatchKnowLearn
Ages: 9  16
2642 Views:

The instructor uses a protractor, pen, and paper to demonstrate how to use a protractor to measure angles. (01:44)
October 20, 2009 at 04:38 PM


Not Right For WatchKnowLearn
Ages: 10  18
2025 Views:

Sal Khan discusses the dfference between lines, line segments, and rays in under four minutes.
August 24, 2011 at 11:38 PM


Not Right For WatchKnowLearn
Ages: 8  12
1946 Views:

Identify properties of two and threedimensional figures. Investigate lines of symmetry and classification of figures based on their attributes in this study of Navajo hogans.
June 19, 2012 at 10:17 AM
