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2.5 Internal angles and side lengths


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Last updated 26 October 2012 15:30 by NZTecAdmin

Ask if anyone knows the property that is always true about the angles inside a triangle. If no one says...

angles always add to 180°,

...get them to each draw a triangle of their choice and measure the angles.

Ask the learners if they can make a triangle using 2 half lengths and 1 full length. Why isn’t it possible?

There is at most one possible triangle that can be made from 3 fixed lengths.

To make a triangle, the longest side must be shorter than the sum of the other two sides.

Point out that this can be a good check for reasonableness of answer when they start solving problems with triangles.

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