Tag Archives: geometry

Geometry Application

Obtuse angle on the left (see upside down “T” figure) and perpendicular lines (right angle) on the right.

how to walk on ice

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Hands on Triangles for Boring Worksheet

 

Screenshot 2017-11-24 at 5.50.18 PM

A student came to me with a geometry worksheet, excerpt in photo above. Extemporaneously I created cut out sides of a triangle to help make the concept of lengths of sides of a triangle more concrete.

The concept is that the shorter 2 sides must be longer than the 3rd side or you cannot get a triangle. The worksheet is very abstract and very inaccessible. (Actually there is more to this topic but I am keeping it simple to allow lay people to focus on the instructional strategy and not the “mathy” stuff.)

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Corresponding Angles in Stain Glass

corresponding-angles-in-glass

Found this (above) cool example of corresponding angles (see photo below for explanation). This window photo could be a nice introduction to this type of problem by printing it out on paper and having students match angles as the teacher shows the photo on the Smart Board or screen.

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