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180-(60+40)
=80
setelah itu bandingkan
80/x=60/12
60x=80*12
60x=960
x=960/60
x=16
jadi panjang busur rs adalah 16
= panjang busur PS per panjang busur QR = xper 12cm
40.12 per 60 = 480 per 60
= 8cm