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Kita cari garis pelukis
s = √(7^2 + 24^2) = √(49 + 576) = √625 = 25
Luas permukaan bandul
= Luas 1/2 bola + luas selimut kerucut
= 1/2 . 4πr^2 + πrs
= 2πr^2 + πrs
= πr (2r + S)
= 22/7 . 7 (2(7) + 25)
= 22 (14 + 25)
= 22 (39)
= 858 cm^2