m ( < A) + m (<B) + m (<c) = 180°
m ( < A) = 2 m (<B) = m (<C)
2 m (< B ) + m (<B)+ 2 m (< B) = 180 °
5 m (<B) = 180°
m( <B) = 180° : 5
m (< B ) = 36 °
m (<A) = 2 m( <B) = 2 x 36 = 72°
m(<A)=m(<C)=72° ✔
m ( < A) + m (<B) + m (<c) = 360°
m ( < A) = 2 m (<B) = m (<C)
m ( < A) = 2 m (<B) = m (<C)2 m (< B ) + m (<B)+ 2 m (< B) = 360°
5 m (<B) = 360°
m( <B) = 360° : 5
m (< B ) = 72 °
m (<A) = 2 m( <B) = 2 x 72= 144° ✔