A.33
kll= 1/4× 2× π× r
= 1/4× 2× 22/7 ×21
= 4× 7= 28
= 44× 21= 924÷ 28= 33
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jawaban:
A.33
penjelasan:
kll= 1/4× 2× π× r
= 1/4× 2× 22/7 ×21
= 4× 7= 28
= 44× 21= 924÷ 28= 33