7. keliling = 6+6+9
= 21
8. keliling = 2a+12
32 = 2a+12
32-12 = 2a
20 = 2a
a = 10
maaf klo salah:)
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7. keliling = 6+6+9
= 21
8. keliling = 2a+12
32 = 2a+12
32-12 = 2a
20 = 2a
a = 10
maaf klo salah:)