There is no single rule.
It is a right angled isosceles triangle.
Its long side (hypotenuse) is sqrt(2) times the short sides.
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If a triangle has a right angle, it is a right triangle.
yes it is it is a triangle with a right angle in it
That would be a right triangle. Any triangle that has a right angle in it is a right triangle.
No, if a Triangle has a right angle it is automatically called a right triangle.
They need not be. You can have a right scalene triangle.