December 2018 2 16 Report
Di ketahui,panjang jari2 dua lingkaran masing2 5 cm dan 4 cm,jika jarak pusat 2 lingkaran adalah 15 cm,maka panjang garis singgung persekutuan dalam adalah?
A. 8 cm
B. 9 cm
C. 10 cm
D. 12 cm

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