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ditanya: AB (panjang sisi)
jawab :
luas = s x s
2500= s x s
sisi = √2500= 50 cm
jadi panjang AB = 50 cm
9. diketahui : r = 21 cm
ditanya : luas?
jawab :
luas lingkaran = π x r x r
= 22/7 x 21 x 21 = 1.386 m2