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7.)
∠AOB = 45°
∠COD = 135°
Luas COD = 48 cm²
Luas AOB = X
------------------------
135° / 45° = 48 cm²/X
X = 45° . 48 cm² / 135°
AOB = 16 cm² (b)

10.)
45 / 360 x L
= 45 / 360 x 22/7 x 14 x 14
= 77 cm² (c).