bantuin ya kak pakai cara

jika garis k dan l sejajar, maka
A = C = E = G
B = D = F = H

sehingga
A = C = E = G = 74°

sementara itu E + F = 180° (garis lurus)
sehingga
F = (180-74)° = 106°
jadi
B = D = F = H = 106°