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= (54+30) x 5 : 2
= 84 x 5 : 2
= 210
K = S₁+S₂+S₃+S₄
= 54 + 30 + 13 + 13
= 110
2.K = S₁+S₂+S₃+S₄
= 36+36+20+20
= 112