But is it possible to somehow prove without using Pythagoras Theorem or common sense?
Edit:I just worked out the proof, but if you have ways to prove it other than the angles of an iscoceles triangle and possibly angles of an equaliteral triangle it would be interesting to hear.

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## Comments

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TopNewestIf you put it in a square, the top vertice won't touch the side of the square.

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Ok, thanks

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Did anyone else get this as their childhood interpretation of the A=bh/2 proof with equalateral triangles? I did.

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But is it possible to somehow prove without using Pythagoras Theorem or common sense? Edit:I just worked out the proof, but if you have ways to prove it other than the angles of an iscoceles triangle and possibly angles of an equaliteral triangle it would be interesting to hear.

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I know this is messy, but please?

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