The spelling of two congruent right triangles into a convex quadrilateral I'll just ask how many spellings there are. Don't ignore me

The spelling of two congruent right triangles into a convex quadrilateral I'll just ask how many spellings there are. Don't ignore me

Short right angle side to short right angle side, get parallelogram
The long right angle side is parallelogram to the long right angle side
Hypotenuse to hypotenuse to form a rectangle or any symmetrical quadrilateral
There are 4 kinds in total

Four congruent right triangles can be used to spell out several different isosceles

2 kinds

Two identical isosceles right triangles can be combined into a () or (). Two completely coincident isosceles trapezoids can be combined into ()

Two identical isosceles right triangles can be combined into a (parallelogram) or a (square). Two completely coincident isosceles trapezoids can be combined into a (parallelogram)