예)원기둥의겉넓이1884㎠밑면의반지름이10㎝높이-겉넓이구하는공식으로구함.반지름r,높이h면,원기둥의겉넓이=2πr²+2πrh/1884=2x3.14x10²+2x3.14x10xh/h=20
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