Every triangle has three sides and three angles
Depends on the size of the triangle. Triangle only tells the shape, not the size.
A triange can be of any size
In an isosceles triangle, two of the angles are the same.
A triangle does not have a specific measurement in centimeters, as it depends on the size of the triangle's sides. Each side of a triangle can have its own length in centimeters, which would determine the overall size of the triangle.
The answer will depend on how the triangle is situated within the rectangle (how many of the triangle's vertices coincide with those of the rectangle), and what other information you have.
If it is an equilateral triangle then it will have 3 equal angles If it is an isosceles triangle then it will have 2 equal angles plus another different size angle
There is no such thing as a milemeter. Assuming you meas millimetres, there is no answer possible because it will depend on the shape and size of the triangle as well as what characteristic of the triangle is being measured.
Yes.
It is 4/9 of the small triangle plus the size of the small triangle
A scalene triangle can be the size of a mosquito or the size of a city. The only thing you know about it is that no two of its sides are equal. If you only know that it's a scalene triangle, then there's no way to know how long any of its sides is.
An isosceles triangle.
The term that describes such a triangle is "congruent." Two triangles are congruent if they have the same shape and size, meaning that one triangle can be transformed into the other through rotation, reflection, or translation. If a triangle is defined by specific conditions (such as side lengths or angles), no other triangle with different dimensions can satisfy those same conditions.