Ukuguqula u-90°

Asiguqule i-engeli engu-$\displaystyle 90^{\circ}$. Cindezela , thayipha 90, bese ucindezela . I-$\displaystyle 90^{\circ}$ ingamaradiyani 1.570796327, okungu-$\displaystyle \frac{\pi}{2}$. Cindezela futhi: amagrad 100.. Kanye futhi, , : sibuyela kumadigri 90..

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