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seluruh = 10,5 ÷ 3/4
= 10,5 x 4/3
= 14 cm
Luas = pi x r x r
= 22/7 x 14 x 14
= 616 cm persegi
= 10,5 . 4 /3
= 14
Luas = π r²
= 22/7 . 14 .14
= 616