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daerah yg diarsir = 1/2 x luas
daerah yg tk diarsir = 1/2 x luas
luas = ?
luas = π x r x r
luas= 22/7 x 7 x 7
luas= 154 cm²
luas daetah yg diarsir = 1/2 x luas
luas daerah yg diarsir = 1/2 x 154
luas daerah yg diarsir = 77 cm²