Triangles 8306

Find out how many triangles you create from lines 7 dm, 5 dm, 10 dm, 12 dm, and 15 dm long.

Correct answer:

n =  7

Step-by-step explanation:

s: 5,7,10,12,15 5710 51012 51215 71012 71015 71215 101215  n=7

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