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Two scalene right triangles that are congruent, that is, that have identical size and shape, if joined together to form a quadrilateral, will form a rectangle.
Any 2 congruent triangles joined together will form a 4 sided quadrilateral
There are two types of quadrilaterals that are formed when two congruent equilateral triangles are joined. These shapes are rhombus and parallelogram.
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.
there are 14 obtuse angled triangles. to work this out, join all the vertices together, making a 7-pointed star. then count all the obtuse-angled triangles. i got 14...you might get a different answer, if so, i apologise. lol i know where u got this question from... anyway hoped i helped :)