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P = P₁ - P₂
P₁ = ½ * 20 * 30 = 300
P₂ = ½ * 5 * 30 = 75
P = 300 - 75 = 225 mm²
b) P = P₁ - P₂ - P₃ - P₄
P₁ = 20*25 = 500
P₂ = ½ * 5 * 25 = 62,5
P₃ = ½ * 5 * 20 = 50
P₄ = ½ * 15 * 20 = 150
P = 500 - 62,5 - 50 - 150 = 237,5 mm²
c) P₁ = 20 * 25 = 500
P₂ = ½ * 5 * 20 = 50
P₃ = ½ * 10 * 25 = 125
P₄ = ½ * 10 * 10 = 50
P = 500 - 50 - 50 - 125 = 275 mm²
d) P₁ = 25*20 = 500
P₂ = ½ * 10 * 20 = 100
P₃ = ½ * 15 * 20 = 150
P₄ = ½ * 5 * 15 = 37,5
P₅ = ½ * 5 * 10 = 25
P = 500 - 100 - 150 - 37,5 - 35 = 177,5 mm²