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= 39-7= 32
= 32:2=16+7=23
lebar = 78:2= 39
= 39-7= 32
= 32:2=16
keliling = 2x(p+l)
= 2x(23+16)
= 2x39=78cm
B. luas = p x l
= 23 x 16
= 368