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shortest side
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.
do you have an angle measure? (if it is an equilateral triangle all legs will be 8 but i don't think this applies in your case)
Measure the three lengths and add them together to find out the perimeter. adding its three sides
I cut out the lengths to have a visual look at the problem and the answer is NO you cannot arrange 5cm, 12cm, and 19cm into a triangle. Even straightening out the lengths of 5cm and 12cm into a 180 degree angle will not measure out to the 19cm. You cannot have a side that is more than the length of the other two sides combined in a triangle.
12
shortest side
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.
Incorrect. The relationships between the angles inside a triangle will be identical to the relationships between the lengths of the sides opposite those angles. For example, take any scalene triangle with the corners A, B, and C. If ∠A is the widest angle, ∠B is the mid-range, and ∠C is the smallest, then B→C will be the longest side, A→C will be the mid-range side, and A→B will be the shortest side.
that's an iscoceles triangle...
angle with the greatest measure
The shortest side of a triangle is opposite to the smallest interior angle.
An isosceles triangle has 3 sides 2 of which are equal in lengths An equilateral triangle has 3 sides all of which are equal in lengths
It depends on what you wish to measure: the lengths of sides, the angles, the area, the perimeter.
shortest
angle
angle with smallest measure - apex