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a = 22
a = 45 . 22
16,5
a = 60°
< QOR = 60°
b) 45/360 x K = 16,5
1/8 x K = 16,5
K = 16,5 x 8
K = 132 cm
2πr = K
2 x 3,14 x r = 132 cm
r = 132 : 6,28
r = 21 cm
jari - jari OP = 21 cm
c) L = πr²
= 22/7 x 21 x 21
= 1386 cm²
OPQ = 45/360 x 1386
= 173, 25 cm²
OQR = 60/360 X 1386
= 231 cm²