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r = 8 cm
V = 640 cm³
dit:
t dan s = ?
Jwb:
Volum:
V = 1/3 x x r² x t
640 = 1/3 x 3,14 x 8² x t
1920 = 3,14 x 64 x t
1920 = 200,96 x t
1920/200,96 = t
t = 9,5
s = √(r²+t²)
s = √(8²+9,5²)
s = √(64+90,25)
s = √154,25
s = 12,4 cm
Salam...... ^^