Roboguru

Volume benda berikut ini adalah ...

Volume benda berikut ini adalah ...space 


 


 

  1. begin mathsize 14px style 12.127 comma 5 space cm cubed end style 

  2. Error converting from MathML to accessible text. 

  3. begin mathsize 14px style 16.978 comma 5 space cm cubed end style 

  4. begin mathsize 14px style 19.404 space cm cubed end style 

Jawaban:

Bangun ruang tersebut merupakan gabungan dari tabung dan setengah bolah

volume tabung 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight d equals cell 21 space cm end cell row straight r equals cell 1 half cross times 21 end cell row blank equals cell 21 over 2 space cm end cell row straight t equals cell 28 space cm end cell row blank blank blank row cell straight V subscript tabung end cell equals cell πr squared straight t end cell row blank equals cell 22 over 7 cross times left parenthesis 21 over 2 right parenthesis squared cross times 28 end cell row blank equals cell fraction numerator 22 cross times 21 cross times 21 cross times 28 over denominator 7 cross times 2 cross times 2 end fraction end cell row blank equals cell 22 cross times 3 cross times 21 cross times 7 end cell row blank equals cell 9.702 space cm cubed end cell end table end style 

Volume setengah bola

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight d equals cell 21 space cm end cell row straight d equals cell 1 half cross times 21 end cell row blank equals cell 21 over 2 space cm end cell row blank blank blank row cell straight V subscript setengah space bola end subscript end cell equals cell 4 over 3 πr cubed end cell row blank equals cell 4 over 3 cross times 22 over 7 cross times open parentheses 21 over 2 close parentheses cubed end cell row blank equals cell fraction numerator 4 cross times 22 cross times 21 cross times 21 cross times 21 over denominator 3 cross times 7 cross times 2 cross times 2 cross times 2 end fraction end cell row blank equals cell 11 cross times 21 cross times 21 end cell row blank equals cell 4.851 space cm cubed end cell end table end style 

Maka volume benda tersebut adalah 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight V equals cell straight V subscript tabung plus straight V subscript setengah space bola end subscript end cell row blank equals cell 9.702 plus 4.851 end cell row blank equals cell 14.553 space cm cubed end cell end table end style  

Jadi jawaban yang tepat adalah B.

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