That's an isosceles right triangle.
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the triangle is called right handed triangle
right angled isosceles triangle
If two sides and the included angle of one of one of the triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.
A triangle with two congruent sides is isosceles. A triangle with an angle of 104 degrees is obtuse. So you would have an obtuse isosceles triangle.
angle SKL = angle CGFangle KLS = angle GFCangle LSK = angle FCGSK = CFKL = FGSL = CG.