1) x - 1 с. y - 2 с. x^2 + y^2 = 20^2 = 4002) x^2 + y^2 = (x+y)^2 - 2xy = 4003) (x+y)^2 = 400 + 384 = 784x+y = 28P = 2(x+y)=28*2 = 56Ответ: P = 56 см.
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1) x - 1 с. y - 2 с. x^2 + y^2 = 20^2 = 400
2) x^2 + y^2 = (x+y)^2 - 2xy = 400
3) (x+y)^2 = 400 + 384 = 784
x+y = 28
P = 2(x+y)=28*2 = 56
Ответ: P = 56 см.