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@UnkleRhaukus hope your not here to troll me again
thats not my style @virtus
i can see four 2x2 triangles
16, 1x1 triangles
i suppose the dont have to be right angles
@virtus do you have options?
not sure what you mean by options @ash2326 but incase you were wondering, my solution book says 9C3 -8
@UnkleRhaukus you have PARTIALLY redeemed yourself
i feel better already,
good to know, why don't you change feeling "good" to "euphoric" by suggesting why the answer is 9C3 -8
say you want to find all the triangle that have the top left as a vertex, how many can you make
9C3 -triples which are in the same line=9C3-8 |dw:1342275604359:dw|
i count eighteen |dw:1342275638118:dw|
there are so many
but hows that joining three dots?
mukushla is right , we are misusing the straight lines because they are not triangles
different triangles can be formed by joining 3 of the dotes unless 3 dots are in the same line, so C(3,9)-8
but why is do we minus 8
*why do we
u can count triples of dots that are in the same line just like what i did up there
this is not a triangle |dw:1342276198984:dw|