Area is rectangle b x h where b is length and h is width of rectangle. The diagonal divides the rectangle into two identical right triangles.

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Answered 3 years ago.

Why is area of a triangle 1 2bh. Also the Congruent Area Axiom If a region mathR_1. Why is the area of a triangle 1 2BH. To axiomatize the concept of areas we have something called the Rectangular Area Axiom.
Therefore area of one triangle. The area of a rectangular region is equal to the product of its length and breadth. Therefore area of two triangles b x h.
Since the area of this triangle is half of the area of a parallelogram the formula for the area of this triangle A 12BH.

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