Question

ABCD este patrulater convex
AC este diagonala
m(DÂB)=85°
m(DÂC)=28°
m(D)=105°
m(ÂCB)=60°
m(CÂB,B,ÂCD.ÂCD)=?
PS:TOATE SUNT UNGHIURI

Answer 1

m(<CAB) = m(<DAB)-m(<DAC) = 85-28=57 grade
m(<B) = 180 - (m<CAB +m<ACB)=180-(57+60) = 180-117 = 63 grade
m(<ACD) = 180 -(m<DAC + m<D) = 180 -(28+105) = 180 - 133 = 47 grade