cara mengerjakan soal nomor 15

QR = PGSPL
d = pusat = R + r = 8 + 4 = 12 cm


QR = akar (d^2 - (R - r)^2)
QR = akar (12^2 - (8-4)^2)
QR = akar (144 - 4^2)
QR = akar (144- 16)
QR = akar (128) (b.)

Smgmbntu
Note : ^ = pangkat
Pusat = R + r krn menyatu