That's true.
In a right triangle, the square of one side must be the sum of the squares of the other two sides.
So it's impossible for all three sides to be equal.
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That's an isosceles right triangle.
A scalene triangle is one that has three lengths of different sizes. It is quite possible for a right triangle to have three sides of different length.
the triangle is called right handed triangle
congruent; hypotenuse and a leg
LL Congruence theorem says: If the two legs of one right triangle are congruent to the two legs of another right triangle, then the two right triangles are congruent.