anonymous
  • anonymous
9 dots are drawn as below. How many triangles can be formed by joining three dots?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1342275033333:dw|
anonymous
  • anonymous
@UnkleRhaukus hope your not here to troll me again
UnkleRhaukus
  • UnkleRhaukus
thats not my style @virtus

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More answers

UnkleRhaukus
  • UnkleRhaukus
i can see four 2x2 triangles
UnkleRhaukus
  • UnkleRhaukus
16, 1x1 triangles
UnkleRhaukus
  • UnkleRhaukus
i suppose the dont have to be right angles
ash2326
  • ash2326
@virtus do you have options?
anonymous
  • anonymous
not sure what you mean by options @ash2326 but incase you were wondering, my solution book says 9C3 -8
anonymous
  • anonymous
@UnkleRhaukus you have PARTIALLY redeemed yourself
UnkleRhaukus
  • UnkleRhaukus
i feel better already,
anonymous
  • anonymous
good to know, why don't you change feeling "good" to "euphoric" by suggesting why the answer is 9C3 -8
UnkleRhaukus
  • UnkleRhaukus
say you want to find all the triangle that have the top left as a vertex, how many can you make
anonymous
  • anonymous
9C3 -triples which are in the same line=9C3-8 |dw:1342275604359:dw|
UnkleRhaukus
  • UnkleRhaukus
i count eighteen |dw:1342275638118:dw|
UnkleRhaukus
  • UnkleRhaukus
19,20|dw:1342275746454:dw|
UnkleRhaukus
  • UnkleRhaukus
there are so many
anonymous
  • anonymous
but hows that joining three dots?
UnkleRhaukus
  • UnkleRhaukus
mukushla is right , we are misusing the straight lines because they are not triangles
anonymous
  • anonymous
different triangles can be formed by joining 3 of the dotes unless 3 dots are in the same line, so C(3,9)-8
anonymous
  • anonymous
but why is do we minus 8
anonymous
  • anonymous
*why do we
anonymous
  • anonymous
u can count triples of dots that are in the same line just like what i did up there
UnkleRhaukus
  • UnkleRhaukus
this is not a triangle |dw:1342276198984:dw|
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
6

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