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luas belah ketupat= 1/2 x 60 x 60= 1800 cm2
luas daerah diarsir= 2826 - 1800= 1026 cm2
(π × r²) - (1/2 x d1 × d2 )
(3,14 × 30 × 30) - (1/2 × 60 × 60)
2826 - 1800
1026
Berarti luas yang diarsir adalah 1026 cm²
Jawabannya = B