The answer depends on what you need to do. You can always use a ruler to measure the sides. Or you may be able to use trigonometry to calculate them - except that you will still need to know the length of one side.
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If the angles are given then the sides a can be worked out by using trigonometry providing that at least one side is given.
Yes, a triangle can be constructed if all sides are given.
Equilateral Triangle.
By using sides we get area of triangle and then using (1/2)heightxbase we get height.
You will also need the angles so that you can use the Isosceles Triangle Theorems to solve for the base of isosceles triangle when only two sides are given.
you can fine the perimeter