okay, what about it? two of its sides are identical. the third side will be rad 2 times as long as the two identical sides. this is a kind of special triangle, another being an eqilateral (60/60/60) and 30-60-90.
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A triangle with a 90 degree angle and two 45 degree angles.
It is an isosceles right angle triangle that has two equal sides which has two 45 degree angles and a 90 degree angle.
A right angle triangle with 45, 45 and 90 degree angles is similar to an isosceles triangle
There are an infinite number of different triangles, with all different shapes and sizes, that all have 45-degree angles. If it happens to be a right triangle, then it has two 45-degree angles, and it's an isosceles right triangle.
It is an isosceles triangle; and if it has a 90 degree angle and two 45 degree angles then it is an isosceles right angle triangle.