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volume irisan kerucut = 3/4 x 1/3 x phi x r^2 x t
= 3/4 x 1/3 x 22/7 x 7 x 7 x 10
= 4620/12
= 385 cm^3
jawaban C
no 89)
r = 7
t = 24
s = 25
luas karton yg tersisa = luas karton - 2 x luas selimut kerucut
= (50x25) - (2x22/7x7x25)
= 1250 - 1100
= 150 cm^2
jawaban A