tolong pakai cara ya pliss

KO = 24 cm, maka LN = 24 cm
MN = MO - KL
= 72 cm - 40 cm
= 32 cm
phytagoras
LM ^2 = LN^2 + MN^2
LM^2 = 24^2 + 32^2
LM^2 = 576 + 1024
LM^2 = 1600
LM = akar 1600
LM = 40 cm

keliling = 40 + 40 + 72 + 24
= 176 cm ( B )