Constructed 67424

There are six lines 3 cm, 4 cm, 5 cm, 7 cm, 8 cm, and 9 cm long, two of each length. How many isosceles triangles can be constructed from them? List all options.

Correct answer:

n =  20

Step-by-step explanation:

a+b>c b+c>a a+c>b  3,3,4 3,3,5  4,4,3 4,4,5 4,4,7  5,5,3 5,5,4 5,5,7 5,5,8 5,5,9  7,7,3 7,7,4 7,7,5 7,7,8 7,7,9  9,9,3 9,9,4 9,9,5 9,9,7 9,9,8  n=20

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