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Mathematics 7 Online
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

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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