A rectangle has 4 sides whereas a triangle has 3 sides
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Rectangle has more right angles than the right triangle. The right triangle only has 1 right angle, while the rectangle has 4.
They are alike inasmuch that a rectangle can be split into two right angle triangles
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.
The diameter of a rectangle is the same as its diagonal (angle in a semicircle is a right angle). So the diagonal forms a right angled triangle with the diagonal as the hypotenuse and two sides of the rectangle (a length and a breadth) forming the legs of the triangle. If the lengths of the sides of the rectangle are known, a simple application of Pythagoras's theorem given the measure of the diagonal.
Quadrant, Right angle triangle, cube, cuboid, rectangle, square and others