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dik: d= 14cm ⇒r=7cm
ukuran ³/₄
Luas permukaan lingkaran= ³/₄ x 4 x π x r²
= 3 x ²²/₇ x 7 x 7cm
= 3 x 22 x 1 x 7cm
= 462cm
jawabannya B.