Ukuguqula u-90°

Ikota yomjikelezo wendilinga ingu-90\displaystyle 90 amadigri, π2\displaystyle \frac{\pi}{2} amaradiyani, noma 100\displaystyle 100 amagrad. 2nd F kanye nenkinobho yephoyinti ledesimali D R G iguqula inombolo esesikrinini iya kuyunithi ye-engeli elandelayo. Cindezela u-on C, thayipha 90, bese u-second F kanye u-D R G. Amadigri angu-90\displaystyle 90 yi-12π\displaystyle \dfrac{1}{2}\pi amaradiyani. Futhi u-second F, u-D R G kunikeza 100. amagrad. Futhi u-second F, u-D R G kubuyela ku-90. amadigri.