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Lingkaran di atas yang memiliki luas begin mathsize 14px style 1.256 space cm squared end style adalah gambar ...

Jawaban:

Luas lingkaran (a).

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell straight pi r squared end cell row blank equals cell 3 comma 14 times open parentheses 40 over 2 close parentheses squared end cell row blank equals cell 3 comma 14 times 20 squared end cell row blank equals cell 3 comma 14 times 400 space end cell row blank equals cell 1.256 space cm squared end cell end table end style  

Luas lingkaran (b).

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell straight pi r squared end cell row blank equals cell 22 over 7 times 35 squared end cell row blank equals cell 22 over 7 times 35 times 35 end cell row blank equals cell 22 times 35 times 5 space end cell row blank equals cell 3.850 space cm squared end cell end table end style 

Luas lingkaran (c).

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell straight pi r squared end cell row blank equals cell 22 over 7 times 28 squared end cell row blank equals cell 22 over 7 times 28 times 28 end cell row blank equals cell 22 times 28 times 4 space end cell row blank equals cell 2.464 space cm squared end cell end table end style 

Luas lingkaran (d).  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell straight pi r squared end cell row blank equals cell 22 over 7 times open parentheses 42 over 2 close parentheses squared end cell row blank equals cell 22 over 7 times 21 squared end cell row blank equals cell 22 over 7 times 21 times 21 end cell row blank equals cell 22 times 21 times 3 space end cell row blank equals cell 1.386 space cm squared end cell end table end style 

Jadi, lingkaran di atas yang memiliki luas begin mathsize 14px style 1.256 space cm squared end style adalah gambar (a).

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