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mencari rusuk tegak dulu
rusuk tegak = 12 ----> dari triple pitagoras 5,12,13
luas sisi tegak = luas alas + 3 x lluas Δ
= (sisi x sisi) + 3 ( 1/2 x alas x tinggi)
= ( 10 x 10 ) + 3 x 1/2 x 10 x 12
= 100 + 180
= 280
35. 2874,66 (D)
tinggi tabung = 2 x diameter tabung
28 = 2d ---- d = 14 cm
r bola = r tabung = 7 cm
volume air yg tumpah = volume benda yg di masukkan
volume bola = 4/3 π r³
= 4/3 x 22/7 x 7x 7 x 7
= 1437,3
volume tabung = luas alas x tinggi
= π x 7 x 7 x 28
= 4312
volume yg tersisa = 4312 - 1437,3 = 2874,66