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volume kerucut = 1/3 x luas alas x tinggi
= 1/3 x π x r x r x t
= 1/3 x 3,14 x 5 x 5 x 18
= 471 (D)
23
panjang rusuk = diameter bola = 12 cm
volume bola = 4/3 π r³
= 4/3 x π x 6 x 6 x 6
= 288 π (C)
24
tarik garis dari Q ke SR,
perpotongan dengan TU di kasi nama titik A
perpotongan dengan titik SR di kasi nama titik B
panjanng BR = 21 - 11 = 10
panjang AU = 11 + x
PT : TS = 2 x : 3x
20 = 55 + 5x
-35 = 5x
x = -7
panjang AU = 11 + x = 11 + ( - 7 ) = 4
maka panjang TU = 11 + 4 = 15 (C)