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40= 4s
s= 10
D1=16
D2=?
X^2= 10^2-8^2
= 100-64
= 36
X= √36
= 6
jadi,d2 = 6*2=12
L alas = 1/2*d1*d2
= 1/2*16*12
= 8*12
= 96 cm ^2
V limas = 1/3*L alas*t
= 1/3*96*21
= 672 cm^3
L alas = 1/2 *D1*D2