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The height of a cylindrical carton is 15cm. If the height is reduced by 2cm, the surface area will be reduced by 188.4cm I learned 188.4 △ 2 = 94.2 (CM) 94.2 △ 3.14 △ 2 = 15 (CM) 15 × 15 × 3.14 = 706.5 (square cm) 94.2 × 15 = 1413 (square cm) 706.5 × 2 + 1413 = 2826 (square cm)
Circumference of the bottom surface of the cylinder: 188.4/2 = 94.2 cm,
The radius is 94.2/3.14/2 = 15 cm,
The area of the two bottom surfaces is: 15 * 15 * 3.14 * 2 = 1413 square centimeters
The side area is: 15 * 94.2 = 1413 square centimeters
The surface area is: 1413 + 1413 = 2826 square centimeters
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