Ivo wants to draw all the triangles whose two sides of which have a length of 4 cm and 9 cm, and the length of the third side is expressed in whole centimeters. How many triangles does he have?

Correct answer:

n =  7

Step-by-step explanation:

a=4 cm b=9 cm  a < b+c b < a+c c < a+b  4 < 9+c 9 < 4+c c < 9+4   c > 5  c < 13   5 < c < 13  c: 6,7,8,9,10,11,12  n=7

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