OER Commons - Search Results
https://www.oercommons.org
daily12000-01-01T12:00+00:00Building with Triangles
https://www.oercommons.org/courses/building-with-triangles-2
This 3 lesson instructional unit helps students investigate many different aspects of triangles including basic properties of triangles, building other shapes from triangles, the dependence of the third side length on the other two (Triangle Inequality Theorem), and the Sierpinski Triangle fractal. The lesson includes student activity sheets and links to interactive applets.Marea W. ChannelEducationMathematicsGeometry2016-02-07T21:36:24.258733Course Related MaterialsTriangles calculator - TrianCal
https://www.oercommons.org/courses/triangles-calculator-triancal
http://TrianCal.esy.es - Open in Google Chrome. (Triangles online calculator developed by Jesus S.)
YouTube: https://youtu.be/V2IV7lY52mA
I propose this free online calculator triangles without advertising to help students with geometry, does not perform the duties, because their calculations formulas are not displayed. It is designed in a didactic way to check and view the realized duties.
TrianCal is online calculator triangles that works with any combination of values including sides, heights, angles, the area or perimeter of any triangle, calculating it with the minimum possible value (typically three).
Other functions:
- Draw the triangle (s) with GeoGebra.
- Set the range of values in each element.
- The type of angle.
- The type of triangle by its angles and sides.
- Selection of language (English or Spanish).
- Select the angle type [degrees (°), radians, degrees, minutes and seconds (° ' ") or degrees and minutes (° ')].
- Number of decimal places shown in the results (0-15).
- You can use the arrow keys and the Tab key to navigate through the settings.
- Drop-down menu to select the values comfortably.
- Create a link (URL) to the current triangle.
- An icon mail to communicate with the author.
NOTE: You must use the Google Chrome browser to display correctly TrianCal.
Examples of possible combinations:
- The area, perimeter and other data (side, height or angle), if the outside equilateral triangle would not need the third data.
- 2 angles and other data (if the value of the other data is not put aside the value of "a" at the time of drawing the triangle is 10).
- One side, one high and one angle.
- 3 heights.
- 3 sides.
- 2 heights and perimeter.
- Any other combination of values.
MathematicsGeometry2015-12-28T10:48:13.790336Course Related MaterialsMirror, Mirror
https://www.oercommons.org/courses/mirror-mirror-4
In this math lesson, learners use hinged mirrors to discover that regular polygons are composed of triangles tessellating around a center point. Learners then sketch these triangles on paper models of regular polygons with 3 to 10 sides and compute the measure of the center angles formed by these triangles in each of the different polygons. Next, learners explore geometric concepts as they use mirrors and paper polygons to determine which regular polygons tessellate. Learners are challenged to give reasons why some polygons tessellate and others do not.PBSUS Department of EducationEducationMathematicsGeometry2015-12-28T02:08:29.022584Course Related MaterialsClassifying Triangles Based on Equal Sides
https://www.oercommons.org/courses/classifying-triangles-based-on-equal-sides-2
This short video and interactive assessment activity is designed to teach fourth graders about classifying triangles based on equal sides.MathematicsGeometry2015-11-24T13:11:03.743282Course Related MaterialsTurning the Tables
https://www.oercommons.org/courses/turning-the-tables
In this activity, learners explore geometry and spatial relationships as they figure out how to arrange tables for a party. Learners use six triangular cut-outs to represent the tables, which must seat exactly six people with only one person per side. This activity guide contains sample questions to ask, literary connections, extensions, and alignment to local and national standards.Children's Museum of HoustonChildren's Museum Of HoustonExxonMobilEducationMathematicsGeometry2015-10-23T15:23:31.760013Course Related MaterialsPyramids and Triangles
https://www.oercommons.org/courses/pyramids-and-triangles
Straws and pipe cleaners are terrific materials for building models of pyramids and cubes. Start out building a triangle or square, then make it three dimensional and turn them into pyramids or cubes by adding more straws. Try making two triangles into a square! This activity is a great introduction into geometry and measurement. The activity does not go into detail about how to use the pipe-cleaners with the straws, but taking non-bendy regular drinking straws and filling them with pipe cleaners so that a little sticks out on either end, works best. The straw keeps the structure sturdy, and the pipe cleaner ends are used to twist tie other pipe cleaner/straw combos together.National Science FoundationScience Learning NetworkScience Museum of MinnesotaUnisysMathematicsGeometry2015-09-03T16:41:08.158795Course Related Materials