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OpenStudy (anonymous):
medals rewarded! How many triangles can you form if you draw all the diagonals from one vertex of a pentagon? a.2 triangles b.4 triangles c.3 triangles d.5 triangles
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terenzreignz (terenzreignz):
<shrugs> Let's just draw one...|dw:1373897241471:dw|
terenzreignz (terenzreignz):
And let's choose this vertex... (it doesn't really matter which)|dw:1373897270142:dw|
terenzreignz (terenzreignz):
Now, a diagonal is a line segment joining a vertex with another vertex WHICH IS NOT adjacent to it... means not these vertices...|dw:1373897300816:dw|
terenzreignz (terenzreignz):
So let's draw...|dw:1373897320762:dw| So... @bettni .... how many triangles? :P
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