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Keliling Lintasan = 20 x 2 + 3,14 x 10 = 40 + 31,4 = 71,4 m
22.) Jawabannya B
Besar ACD = 25° + (90° - 60° - 25°) = 25° + 5° = 30°
Besar BCD = 30° + 25° = 55°