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Persegi >> 20x20 = 400m^2
Stg lgkrn >> 1/2 x 3.14 x 10 x 10 = 1/2 = 157 m^2
Segitiga >> 20x8/2 = 10x8 = 80m^2
400 - 157 - 80 = 163 m^2
2.
Lgkrn >> 22/7 x 14 x 14 = 44 x 14 = 616 cm^2
Lyglyg >> 14x28/2 = 7x28 = 196 cm^2
616 - 196 = 420 cm^2