It is because it is the new Arc Reactor for the Ironman suit. The old one had palladium, which poisoned his blood. He then discovered a new element, which worked perfectly for the new reactor.
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An isosceles triangle is a triangle with 2 congruent sides and 2 congruent angles.
An isosceles triangle is a triangle with 2 congruent sides. (2 sides are the same length)
An Isosceles Triangle.
A right triangle can be an isosceles triangle, because the definition of an isosceles triangle is a triangle that has 2 sides equal to each other. A 45,45,90 degree triangle has 2 sides equal to each other, while the hypotenuse is different. It cannot be an equilateral triangle because of the formula a^2+b^2=c^2. With this formula, there is no possible way that: a, b, and c can all be equal to each other. To recap: It can be an isosceles triangle, but not an equilateral one.
Isosceles triangle.