All triangles are 180 degrees.
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there are three angles on an isosceles triangle
An isosceles triangle can have 1 right angle providing that the other 2 angles each measure 45 degrees.
In an isosceles triangle, two of the interior angles have the same number of degrees. This is because an isosceles triangle has two sides of equal length, which means the two base angles (the angles opposite those equal sides) are congruent. The third angle, called the apex angle, can be different from the base angles unless the triangle is also equilateral.
Infinitely many. Having found one triangle, you can find infinitely many similar triangles.
The triangle will then have 3 angles of 45, 45 and 90 degrees and take the shape of an isosceles right angle triangle.