They are both triangles that have interior degrees of 180 and exterior degrees of 360.
An equilateral has three equal sides and three equal angles.
An isosceles has two equal sides and two equal angles.
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360 degrees, 90 degrees per angle, you can make two trangles inside of it, and triangles are 180 degrees
None; because there is no justification for assuming that the two triangles (or trangles, as you prefer to call them) are similar.
It's to do with The Greek mathematician called Pythagoras. He was into trangles, particulary right angles ones, where he came up with a theory that relates the lengths of each side in a right angle triangle.
The Pentagonal Rotunda has 20 vertices, 17 faces and 35 edges. The Pentagonal Rotunda contains 10 trangles, 6 pentagons and 1 decagon.
The theory in right-angled trangles that the hypotenuse (The Side opposite the right angle) squared is equal to the the other 2 sides both squared, added together. So the formula for "Pythagorus Theorum" is a^2 + b^2 = h^2