If you're talking about length there's no way of knowing w/o knowing the angles.
I expect given the lengths that you are referring to a Right Triangle and the ratio you are looking for is the standard 3, 4 and 5 triangle. The 5 represents the hypotenuse and the 3 and 4 are the ratios of the sides of the right angle. Hence in your example the answer would be 12.
No side of a triangle is ever parallel to any other side of the same triangle.
Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
The area of triangle is : 56.0
An isosceles triangle
It is the same length as the corresponding side on the other triangle.
The unequal side of an isosceles triangle is called the base.
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
If one side of a right angled triangle is 32 and the other side is 43 the hypotenuse is 53.6
hypotenuse
We know that Triangle is made up of three sides. Side is a line segment joined with other line segments in triangle and vice versa
If one side of the triangle is 8cm then the other side is 7cm because 0.5*8*7 = 28 square cm
Two sides of an isosceles triangle are equal. The base is the other side.