Sabcd = ab*sinc
c = 180* - 150* = 30*
a = 13, b = 16
Sabcd = (16*13)\2 = 104 (sin30* = 1\2)
S=a*b*Sinβ
a=13
b=16
Sinβ=150
S=13*16*Sin150=208*1/2=104 см²
