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kelilingnya a x t :2
lalu cari nilai x
4x+3x+20=180
7x+20 =180
7x =180-20
7x =160
x =22,8
4(22,8) x 3(22,8) :2=3119,04 cm
maka kelilingnya adalah 3119,04 cm
maaf klo salah