တြိဂံ၏ထောင့်များ

Problem(1)

$\begin{aligned} &\angle Y=90^{\circ}, \angle Z=25^{\circ}15^{\prime}, \angle X=? \\ &\angle X+\angle Y+\angle Z=180^{\circ} \\ &\angle X+90^{\circ}+25^{\circ}15^{\prime}=180^{\circ}\\ &\angle X+115^{\circ} 15^{\prime}=180^{\circ} \\ &\angle X=180^{\circ}-115^{\circ} 15^{\prime} \\ &\angle X=64^{\circ} 45^{\prime} \end{aligned}$