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= Luas persegi - (luas segitiga + Luas trapesium)
= (22 x 22) - {(1/2 x 22 x 10) +[1/2 x (22+12) x (22-10)]}
= 484 - (110 + 204)
= 170 cm²
AB = d = 126 cm
r = 1/2 x 126 = 63 cm
L arsir = 4/12 x 22/7 x 63²
= 4158 cm²