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what's the formula for finding the area of a rectangle

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Area = (1/2)(Base)(Height)

Remember that most triangles are 1/2 of a rectangle, so their area is 1/2 of the rectangle's.


Right triangles's area in half of the are of rectangle with height and width equals legs ( sides of the right angle).
   Accordingly the area of a regular triangle is half of the corresponding parallelogram with sides as 2 sides of
 a triangle.