OC bisectoare ABC, imparte in doua unghiuri egale, jumatate din ABC
[tex]\angle{AOB}=\angle{AOC}=29grade 15 minute=\frac{\angle{ABC}}{2}[/tex]
b)[tex](3x+0.4y)^2=9x^{2}+2.4xy+0.16y^{2}[/tex]
c) ABC triunghi isoscel cu AB=AC, atunci [tex]\angle{B}=\angle{C}[/tex] toate unghiurile au suma 180 grade atunci:
[tex]\angle{A)+\angle{B}+\angle{C}=180\Rightarrow 2\angle{C}=180-\angle{A}\Rightarrow \angle{C}=\frac{180-46}{2}=\frac{134}{2}=67[/tex]
d) [tex](6x-7y)(6x+7y)=36x^{2}-49y^{2}[/tex]