It usually is a right angle that represents an isosceles triangle but there are some cases that the right and left side are equal and the base is the one with an unequal length.
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No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.
Never but an isosceles triangle can sometimes be a right angle triangle
No. For example a 3, 4, 5 cm triangle is right angled but not isosceles.
The three angles inside EVERY triangle ALWAYS add up to 180 degrees.In an isosceles right triangle, the angles are 45°, 45°, and 90°.
An isosceles right triangle will always have its shorter sides of the same length, and the hypotenuse will always be this length times sin(45o) or times the square root of 0.5.