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22/7 dikali 21²=66 dikali21=1386
= ¾ x 22/7 x 28²
= ¾ x 22/7 x 784
= ¾ x 22 x 112
= 7392/4
= 1848 cm² ( itu apabila 28 cm = r )
¾ x π x r²
= ¾ x 22/7 x 14²
= ¾ x 22/7 x 196
= ¾ x 22 x 28
= 1848/4
= 462 cm² ( itu apabila 28 cm = d ) ( jadi 14 cm disana = r-nya )
pilih aja .. menurut kamu 28 disana r atau d dua duanya jawabannya bener kok
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