Yes, because 11 + 15 > 21, 11 + 21 > 15, and 15 + 21 > 11
Yes, it is possible.
Yes
yes
No. One of the sides is longer than the other two combined. If the side which is 29 is AB then the side connected to it at A will never be able to meet the side connected to it at B.
No
If you mean side lengths of 5, 4 and 1 then it is not possible to construct any triangle from the given dimensions.
Yes, it is possible.
a scalene triangle is a triangle with three differant sides
No
Yes, it's entirely possible, and quite easy as well.
Yes
yes
yes 3 --- 6| |9
Because the sum of the shortest sides is less than the longest side and in order to construct a triangle the sum of its shortest sides must be greater than its longest side.
No
In order to construct a triangle the sum of its 2 smallest sides must be greater than its longest side.
Because the sum of the smaller sides is greater than the largest side and it is possible to construct one right angle triangle with the given lengths