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Two sides of a triangle measure 7 cm and 15 cm . Which of the following could not be the length of the third side ?

A. 5 cm
B. 9 cm
C. 15 cm
D. 22 cm

I'm confused because at first I tried Pythagorean thereom and it didn't really work .

1 answer

7+15=22
7-15=-8
the line has to be between 8 and 22 to work, otherwise it would be a straight line so it cannot be a, 5cm

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