It depens. It could be 2, it could be 4. It depends on the triangle size.
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4
right triangles and
They are alike inasmuch that a rectangle can be split into two right angle triangles
A=l*w A=8*4 A=32 diagonal cuts the rectangle into two congruent triangles. 32/2 = 16
They are both polygon. If you cut a rectangle diagonally, you will have two triangles. And if you want to figure out the area of a right triangle, you can treat it as a rectangle and then cut your calculation in half to get the correct answer.