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Perhatikan gambar berikut. Jika luas juring  da...

Perhatikan gambar berikut.

Jika luas juring begin mathsize 14px style AOB equals 2 straight pi space cm squared end style dan jari-jari lingkaran begin mathsize 14px style 4 space cm end style, maka panjang busur AB adalah .... 

Jawaban:

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begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell L subscript j u r i n g end subscript end cell equals cell fraction numerator theta over denominator 360 degree end fraction times straight pi times straight r squared end cell row cell 2 straight pi end cell equals cell fraction numerator straight theta over denominator 360 degree end fraction times straight pi times 16 end cell row cell 1 over 8 end cell equals cell fraction numerator straight theta over denominator 360 degree end fraction end cell row blank blank blank row cell P subscript b u s u r end subscript end cell equals cell fraction numerator straight theta over denominator 360 degree end fraction times 2 times straight pi times straight r end cell row cell straight P subscript busur end cell equals cell 1 over 8 times 2 times 3 comma 14 times 4 end cell row cell straight P subscript busur end cell equals cell 3 comma 14 space cm end cell end table end style

Jadi, panjang busur AB adalah begin mathsize 14px style 3 comma 14 space cm end style.

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