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keliling= 4sisi
= 4 x 2a
= 8a
b. panjang= 3a
lebar= 3b
keliling= 2 x ( panjang+ lebar)
= 2 x ( 3a + 3b)
= 6a + 6 b
c. keliling= 8 x a = 8a
d. keliling= a+ b+ c+ (a-c) + d
= a+b+c+a-c+d
= 2a+b+d