Rectangle properties

Lecture

Theorem (property of a rectangle).

The diagonals of the rectangle are equal.

Rectangle properties

Evidence.

Let ABCD be a given rectangle.
Δ DAB = Δ CAB on the first sign (∠ DAB = CBA, AD = BC, as the opposite sides of the parallelogram, AB is common), therefore DB = AC. The theorem is proved.

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Rectangle properties

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Planometry

Terms: Planometry