panjang gk ... a.6 cm b.7 cm c.10 cm d. 9 cm

NG = 4 cm
GH = 18cm
KL = 27cm

NG/(NG+GK) = 18/27
4/(4+GK) = 18/27
72+18GK = 108
18GK = 108-72
18GK = 36
GK = 2 cm

note : pertanyaan nya sudah benar kah?