Triangles Watch

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Jonny W
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#1
Report Thread starter 14 years ago
#1
How many triangles are there in the attached picture?

I am pretty sure that I know, but in a phone-in competition tonight on Sky 160 the presenter said that I was wrong.

I think the channel is a skam.
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JamesF
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#2
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24
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Jonny W
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#3
Report Thread starter 14 years ago
#3
I made it 28:

(those whose lowest numbered vertex is 1) {1, 2, 4}, {1, 3, 4},

(2) {2, 4, 5}, {2, 4, 7}, {2, 5, 7}, {2, 7, 9}, {2, 7, 12}, {2, 8, 12},

(3) {3, 4, 6}, {3, 4, 8}, {3, 6, 8}, {3, 7, 13}, {3, 8, 10}, {3, 8, 13},

(4) {4, 7, 11}, {4, 8, 11},

(5) {5, 7, 9}, {5, 7, 12},

(6) {6, 8, 10}, {6, 8, 13},

(7) {7, 9, 12}, {7, 11, 12},

(8) {8, 10, 13}, {8, 11, 13},

(9) {9, 11, 12},

(10) {10, 11, 13},

(11) {11, 12, 14}, {11, 13, 14}.
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JamesF
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Ahh, i didnt see the {2,7,9} ones, of which there are 4.
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shift3
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28, definately.
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