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jarak BD = 10 cm
LUAS BANGUN 1 (LINGKARAN ) :
L1 = π X r ²
= 22/7 x 7²
= 154 cm
LUAS BANGUN 2 (Layang2 )
L2 = (diagonal AC x diagonal BD) /2
= (14 x 10) / 2
= 70 cm
jadi luas daerah y diarsir adalah L1 - L2 = 154 - 70 = 84 cm