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a) busur = 30/360 × 2 × 22/7 × 7
busur = 3,667 cm
b) juring = 30/360 × 22/7 × 7 × 7
= 12,833 cm^2
2.
a) busur = 60/360 × 2 × 22/7 × 14
busur = 14,667 cm
b) juring = 60/360 × 22/7 × 14 × 14
juring = 359,333 cm^2
semoga berguna.