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panjang = 2y
luas = panjang x lebar
98 = 2y x y
98 = 2y²
98 : 2 = y²
49 = y²
√49 = y
7 = y
panjang = 2y = 2 x 7 = 14
lebar = y = 7 cm
keliling = 2(p+l)
keliling = 2(14+7)
keliling = 2(21)
keliling = 42 cm