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Naming And Measuring Angles

23 minutes 6 seconds
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2 parallel lines outline grooves between wood planks and are intersected by a diagonal line. The 2 angles formed are labeled, "130 degrees" and "50 degrees." Title card reads, "Summary. Angle relationships." Caption. But they add to 180 degrees.

Provides viewers with an introduction to key concepts involved with angles, such as how to define and write information about an angle, mathematical notation for rays, line segments, and lines, and how to use a protractor. Illustrates obtuse and acute angles; investigates the relationships between the angles formed by transversal crossing parallel lines; and introduces congruent triangles by using examples from real life, supplemented by clear graphic overlays and simple animations. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box, (3) subtitled description. Part of the "Mathemania" series.

Media Details

Runtime: 23 minutes 6 seconds

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Person stands next to a post in a park. Superimposed lines create a right triangle with the post and a point a few feet from the person. A second right triangle is between the person and the same point. Inset depicts a hand drawing the triangles with labeled sides. Caption. The post's height is H.
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Grade Level: 7 - 9
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Smiling girl stands behind a wood plank while holding up 3 sticks of wood at an angle to form a rhombus shape. Caption. Then push the square over a bit to make a rhombus.
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2 parallel lines outline grooves between wood planks and are intersected by a diagonal line. The 2 angles formed are labeled, "130 degrees" and "50 degrees." Title card reads, "Summary. Angle relationships." Caption. But they add to 180 degrees.
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Line chart with Y axis labeled, "Distribution, meters," and X axis labeled, "Time in seconds." A line begins from 0,0 and rises steadily to points A at 20, 100, B at 30, 100 and C at 60, 180. Caption. I covered 90 meters in 30 seconds.
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Equation written of black on a white background as follows, 1 over 100 equals 1 over 10 squared equals 10 to the negative power of 2. Caption. Is the same as 10 to the power of negative 2.
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Viewer Comments

  • Tiny default profile photo
    dorothy c. (kansas city, MO)
    February 23rd, 2022 at 07:51 AM

    easy to reach learners and reinforce concepts

  • Tiny default profile photo
    SUSIE V. (Flushing, MI)
    December 31st, 2016 at 05:20 PM

    Excellent and very clear!

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