pada gambar disamping,panjang busur MN=6Πcm dan luas juring OMN=27Π cm².panjang jari-jari ON adalah

Mis a = sudut MON

MN = a x kel lingkaran
6 pi = a x pi x d
6 = a x d
*d = diameter ling, r = jari" ling*
6 = a x 2r
3 = a x r

Juring OMN = a x luas ling
27 pi = a x pi x r x r
27 = a x r x r

Karna a x r = 3 maka,

27 = 3 x r
r = 9


JAWABAN "A"



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