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b. L= 12 x 5 = 60 cm^
2. a. kll= 9+12+18+25= 64
b. L= (18+25)/2×7
= 3 cm^
B. L=d1xd2/2
=12cm x 5cm/2
= 60/2
=30
7. A. 9cm+18cm+25+12cm
27cm+37cm
104cm
B. L =1/2 x A x T
= 1/2 x 25cm x 7cm
= 87,5cm persegi
maaf jika ada kesaahan :D