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AC^2 = 21^2 + 20^2
AC^2 = 441 + 400
AC^2 = 841
AC = √841
AC = 29
keliling bangun = AB + BC + CD + AC
= 21 + 20 + 21 + 29
= 41 + 50
= 91
jadi keliling bangun adalah 91 cm