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Luas permukaan sebuah tabung  dengan panjang jari-...

Luas permukaan sebuah tabung begin mathsize 14px style 1.256 space cm squared end style dengan panjang jari-jari begin mathsize 14px style 10 space cm end style. Tinggi tabung tersebut adalah .... begin mathsize 14px style open parentheses straight pi equals 22 over 7 close parentheses end style 

  1. 5 cm begin mathsize 14px style space end style 

  2. 10 cm begin mathsize 14px style space end style 

  3. 15 cm begin mathsize 14px style space end style 

  4. 20 cm begin mathsize 14px style space end style 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight L subscript tabung end cell equals cell open parentheses 2 times straight L subscript alas close parentheses plus open parentheses straight K subscript alas times straight t close parentheses end cell row cell straight L subscript tabung end cell equals cell open parentheses 2 πr squared close parentheses plus open parentheses 2 πrt close parentheses end cell row cell 1.256 end cell equals cell open parentheses 2 times 22 over 7 times 10 squared close parentheses plus open parentheses 2 times 22 over 7 times 10 times straight t close parentheses end cell row cell 1.256 end cell equals cell fraction numerator 4.400 over denominator 7 end fraction plus 440 over 7 straight t end cell row cell 440 over 7 straight t end cell equals cell 1.256 minus fraction numerator 4.400 over denominator 7 end fraction end cell row cell 440 over 7 straight t end cell equals cell fraction numerator 8.792 minus 4.400 over denominator 7 end fraction end cell row cell 440 over 7 straight t end cell equals cell fraction numerator 4.392 over denominator 7 end fraction end cell row cell 440 straight t end cell equals cell 4.392 end cell row straight t equals cell 9 comma 98 space almost equal to 10 space cm end cell end table end style 

 

Jadi, jawaban yang tepat adalah B.

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