Introduce the Triangle Inequality Theorem

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Triangle Tuesday

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What happens here

The presenter introduces a plywood board with the handwritten rule: "The Sum of Any 2 Sides Must be Greater Than the 3rd Side". He uses a hammer to point to the rule and the mathematical examples he previously demonstrated: "5+6 < 24 X" and "12+12 = 24 X", explaining why these attempts failed. He then introduces the condition for a successful triangle: "12+12 > 17", setting up the next demonstration.

Goal: Clearly state and explain the mathematical rule for forming a triangle

Tools and materials

Hammer — pointing to the text on the board, Plywood Board with Theorem Unknown

What they say

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12 + 12 = 24. Does that work? Nope. All it does is makes a straight line. So, here's the rule. The sum of any two sides must be greater than the third side. So, 5 + 6 less than 24, 12 + 12 equal. So, let's try our next one. So, now we got a 17-in and a 12 and a 12. Let's see if this works.

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