Obwod prostokoata o szerokosci X i dlugosci X+y jest rowny obwodow kwadrata o boku a. Oblicz pole tego kwadratu
Obwód prostokąta
L = 2 *x + 2*( x + y) = 2x + 2x + 2y = 4x + 2y
czyli
4x + 2y = 4a / : 4
x + 0,5y = a
Pole kwadratu
P = a^2 = [ x + 0,5 y]^2 = x^2 + xy + 0,25 y^2
===========================================
Obw. kwadratu = Obw. prostokąta
Obw. prostokąta = 2(x + x+y) = 4x + 2y
Obw kwadratu = 4a = 4x+2y / :4
Bok kwadratu = a = (4x + 2y) : 4 = x + 0,5y
Pole kwadratu= a^2
Pole kwadratu = (x + 0,5y)^2 = x^2 + 0,25y^2
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Obwód prostokąta
L = 2 *x + 2*( x + y) = 2x + 2x + 2y = 4x + 2y
czyli
4x + 2y = 4a / : 4
x + 0,5y = a
Pole kwadratu
P = a^2 = [ x + 0,5 y]^2 = x^2 + xy + 0,25 y^2
===========================================
Obw. kwadratu = Obw. prostokąta
Obw. prostokąta = 2(x + x+y) = 4x + 2y
Obw kwadratu = 4a = 4x+2y / :4
Bok kwadratu = a = (4x + 2y) : 4 = x + 0,5y
Pole kwadratu= a^2
Pole kwadratu = (x + 0,5y)^2 = x^2 + 0,25y^2