It depends on what information you do have.
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An isosceles triangle has 3 sides 2 of which are equal in length
If it is an isosceles triangle then the missing side is 40 cm but for any triangle the sum of its two smaller sides must be greater than its longest side.
1) The hypotenuse side will ALWAYS be the the side w/ the radical 2. 2) So if you want to find the HYPOTENUSE of an ISOSCELES triangle, you MULTIPLY one of the LEGS by the the square root of 2. 3) If you want to find the LEG of an ISOSCELES triangle, you DIVIDE the HYPOTENUSE by the square root of 2. ***** Hypotenuse of an isosceles triangle= one leg divided by square root of 2. ***** Leg of an isosceles triangle= hypotenuse divided by the square root of 2. You can also get all the help you need through my page on Facebook, 'Your Help' Merna Awad-ElSols
it is also an isosceles triangle, it is the same on it's side
The way to find the missing side of a triangle-THIS ONLY WORKS ON RIGHT ANGLED TRIANGLES-is square both sides seperately and then add them together to give you the square of the missing side-find the square root and that is the size of the missing side-eg. if you have a RIGHT ANGLED TRIANGLE with sides of 3inch and 4inch then (3x3) + (4x4) = 25 so the square root of 25 is 5 meaning the missing side is 5inch.