Triangle challenge

Exercise
In this exercise will we work with triangles. [br]Consider the following triangles given by the length of its sides:[br][br]Triangle1: sides are 5 - 5 - 8[br]Triangle2: sides are 5 - 5 - 6[br][br]Which one you think is bigger? [br]Here we are thinking about the area of each triangle.[br]Before we continue, try to make a guess... What do you think?
Solution
We have the following triangles given by the length of its sides:[br][br]Triangle1: sides are 5 - 5 - 8[br]Triangle2: sides are 5 - 5 - 6[br][br]We were asked to think which one of this has bigger area.[br]How did it go? Could you solve it?[br]What reasoning allowed you to solve it? how did you realize?[br][br]Here we present a possible solution that visually is very clear.
Image of the two triangles
Step 1:
Start by drawing the height of each triangle. We can use Pythagoras theorem to find out the height size in this isosceles triangle, since we get right-angled triangles. For example, lets take a look to Triangle1:[br]
Height of the two triangles
Calculation
With the measure of this segments we can calculate the areas of the triangles:[br][math]Area=\frac{1}{2}\times base\times height[/math][br]For Triangle1[br][math]Area1=\frac{1}{2}\times8\times3=12[/math][br]For Triangle2[br][math]Area2=\frac{1}{2}\times6\times4=12[/math][br]So we can check that they have the same area.
Geometric solution
There is a very nice and geometric way to realize this whitout doing any calculation. In fact, we can think of each of this triangles as two copies of a smaller triangle with sides 3 - 4 - 5:
Rotation the triangles
As we can appreciate, when t = 90° we get a copy of Trianlge 2, while when t = 180° we get a copy of a simetric Triangle 1. [br]The fact that rotation of the triangles does not modify the area, we conclude that both triangles has the same surface.

Information: Triangle challenge