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luas = 8x6 = 48
b. keliling = 2x(9+lebar)
32 = 18 + 2 lebar
14 = 2 lebar
7 = lebar
luas = 9x7 = 63
c. keliling = 2x(panjang+15)
80 = 2panjang + 30
50 = 2panjang
25 = panjang
luas = 25x15 = 375
d. luas = 13 x lebar
143 = 13lebar
11 = lebar
keliling = 2x(13+11) = 2x24 = 48
e. luas = panjang x 19
399 = 19panjang
21 = panjang
keliling = 2x(21+19) = 2x40 = 80