To create a triangle, the sum of the two shorter sides must be greater than the third side.
If the longest side is one of the two given sides, then the missing side must be greater than the difference between the two shorter sides.
If the missing side is the longest side then the missing side must be less than the sum of the two shorter sides.
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If you have the length of each of the three sides of a triangle, you can find the perimeter of (the distance around) the triangle by adding the length of the sides. Their sum will be the perimeter of this geometric shape.
By using trigonometry or Pythagoras' theorem depending on what type of triangle it is.
To find the perimeter of a triangle, you need to add the lengths of all three sides. If two sides of the triangle are 6 and 5 units long, you still need to know the length of the third side to find the perimeter. Without the length of the third side, it is not possible to calculate the perimeter of the triangle.
Proportions would be the best way; given the sides of the triangle, use ratios to find the corresponding side on the congruent triangle. For example: if three sides are given, 3, 4, and 5, and you had to solve a triangle with lengths 9, 12, and x, this is how you would do it. Given the triangles are congruent, 4/5 = 12/x 4x = 60 x = 15
Given this area, the sides measure 52.92734 cm