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400 cm= 4 x 1/2 x 10 cm x t
400 cm= 20cm x t
400 cm / 20 cm = t
20 cm= t
jadi tinggi sisi tegak limas = 20 cm
1/3 x s² x t = 400
1/3 x 10² x t = 400
1/3 x 100 x t = 400
t = 400 x 3/100
t = 4 x 3
t = 12
jawabnnya 12 cm