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Perhatikan gambar kerucut berikut! Hitunglah luas selimut kerucut!

Perhatikan gambar kerucut berikut!

 

Hitunglah luas selimut 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 selimut kerucut :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell L subscript s e l i m u t end subscript end cell equals πrs row cell space space space space space space space space space space end cell equals cell 3 comma 14 cross times 9 cross times 15 end cell row cell space space space space space space space space space space end cell equals cell 423 comma 9 space cm squared end cell end table end style   

 

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