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Perhatikan gambar kerucut berikut! Hitunglah luas kerucut!

Perhatikan gambar kerucut berikut!

 

Hitunglah luas kerucut!

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Jawaban:

Panjang jari-jari alas kerucut:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row r equals cell square root of s squared minus t squared end root end cell row space equals cell square root of 15 squared minus 12 squared end root end cell row cell space space end cell equals cell square root of 225 minus 144 end root end cell row cell space space end cell equals cell square root of 81 end cell row cell space space end cell equals cell space 9 space cm end cell end table end style 

luas kerucut :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell L u a s space k e r u c u t end cell equals cell πr open parentheses straight r plus straight s close parentheses end cell row cell space space space space space space space space space space space space space space space space space space space end cell equals cell 3 comma 14 cross times 9 open parentheses 9 plus 15 close parentheses end cell row cell space space space space space space space space space space space space space space space space space space space end cell equals cell 28 comma 26 cross times 24 end cell row cell space space space space space space space space space space space space space space space space space space space end cell equals cell 678 comma 24 space cm squared end cell end table end style 

   

 

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