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d: 21cm r: 10,5cm
Dit: Lsisi kerucut
jwb: panjang miring kerucut: 28(pangkat 2) + 10,5(pangkat 2) = (akar).....
784 + 110,25 = (akar)894,25
= 29,9040... (30 aja)
Lsisi kerucut: panjang sisi miring * tinggi
30*28=840cm(pangkat2)