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Kel lingkaran
= 2 pi r
= 2 * pi * 18
= 36 pi
POQ = 180 derajat
POS = 40 derajat
ROQ = 60 derajat
SOR = POQ - (POS + ROQ)
= 180 derajat - 100 derajat
= 80 derajat
Panjang busur RS = 80/360 * 36 pi = 8 pi (A)
No. 30
AP + BQ = 6 + 2 = 8 cm
Tinggal phytagoras
(D)