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8 dikali 8 : 2= 64:2=32
cara = jari2 x jari2 x pi = 7546
jari² = 7/22 x 7546
jari² = √343
-nomor 9
cara = 8 ( alas ) x 8 ( tinggi ) : 2
= 32 cm²
mohon dikoreksi kembali, salam, moderator