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.
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They are both polygons.
They are alike inasmuch that a rectangle can be split into two right angle triangles
They are both geometric shapes
The relationship between the area of a triangle and a rectangle is a Triangle is base times height divided by 2. Area of a rectangle is length times height.
A rectangle has 4 sides whereas a triangle has 3 sides