Question

Un unghi ascutit al unui triunghi isoscel si obtuzunghic care are masura unghiului obtuz de 130 grade,are masura de:

Answer 1

$\displaystyle\\\text{Se da: }\\\Delta ABC = \text{triunghi isoscel obtuzunghic}\\m(\sphericalangle A)=130^o\\\\\text{Se cere:}\\\\m(\sphericalangle B)=m(\sphericalangle C)= ?\\\\\text{Rezolvare:}\\\\m(\sphericalangle B)=m(\sphericalangle C)=\frac{180^o - A}{2}= \frac{180^o - 130^o}{2}=\frac{50^o}{2}= \boxed{\bf 25^o}$