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Toll station red paint slogan
(1) The side view of the safety identification pier is shown in the right figure.
(2) The upper part of the safety identification pier is a regular quadrangular EFGH,
EFGH is a square with a side length of 60 cm, and the height of the regular pyramid EFGH is 40 cm.
The inclined height of the right pyramid is 402+302 = 50 cm.
The lower part is a cuboid ABCD-EFGH with length, width and height of 60 cm, 60 cm and 20 cm respectively.
∴ Lateral area of safety identification pier:
S = (20× 60+12× 60× 402+302 )× 4 =10800 cm2),
Repaint the safety sign pier with red paint,
Paint per square centimeter 1 ml,
Paint 100 this safety sign pier needs paint:
10800×100 = 1080000 ml =1080 liter.
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