Q. Is it possible to draw a triangle whose sides are 5 cm, 7 cm and 12 cm?
Q. Three points A, B, C are collinear. Can you draw ABC? if not, why?
Q. Two sides of a triangle are 6 cm and 8 cm long. What can be the length of its third side?

Dear Student, 
Kindly refer to the link for the similar query.
https://www.meritnation.com/ask-answer/question/the-lengh-of-2-sides-of-a-triangle-are-4-cm-and-6-cm-between/the-triangle-and-its-properties/6039993
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3) Not possible because sum of two sides is not greater then then third.
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