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x² + 64 = 100
x² = 100 - 64
x² = 36
x = √36
x = 6
Ob = 6 + 8 + 10 + 20 = 44
p = (a+b)*h / 2
p = (8+20) * 6 / 2
p = 28*6 / 2
p = 84