Math, asked by aryanpransu45, 27 days ago

How many triangle are there 12 , 13 , 14 , 15

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Answered by fahai7122

1

Answer:

15

Step-by-step explanation:

formula = N(N-1)/2

so.. triangles are in the above figure is 6.

6(6-1)/2

= 6×5/2

=30/2

=15..

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