Paralelogram – razlika između verzija

|<math>S = ah_a = bh_b = \left| \left|\,\overrightarrow{AB} \, \times \, \overrightarrow{AD}\,\right| \right|</math><br /><math>S \, = \, a \cdot b \cdot \sin\alpha = a \cdot b \cdot \sin\beta = \frac{1}{2} \cdot e \cdot f \cdot \sin \theta</math>

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|<math>e^2+f^2 = 2\left(a^2+b^2\right)</math>

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