6,1 oblicz odległość puntów b)P=(-2,5)i Q=(5,5) c)K=(√2,√2) i L=(-2√2,√2)
6,2 oblicz długosć odcinka AB b)A=(-5,-3) B=(-1,5) c)A=(-6,-1) b=(6,8)
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z.6.1
b) P = (-2; 5), Q = (5; 5)
I PQ I^2 = ( 5 - (-2))^2 + ( 5 -5)^2 = 7^2 +0^2 = 49
zatem I PQ I = 7
lub krócej
I PQ I = 5 - (-2) = 5 + 2 = 7
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c) K = ( p(2); p(2) ), L = -2 p(2) ; p(2))
I KL I = p(2) - (- 2 p(2)) = p(2) + 2 p(2) = 3 p(2)
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p(2) - pierwiastek kwadratowy z 2
z.6.2
b) A = (-5; -3) , B = ( -1 ; 5)
I AB I^2 = ( -1 -(-5))^2 + (5 - (-3))^2 = 4^2 + 8^2 = 16 + 64 = 80 = 16*5
zatem
I AB I = 4 p(5)
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c) A = ( -6 ; -1), B = (6; 8)
I AB I^2 = ( 6 - (-6))^2 + 8 - (-1))^2 = 12^2 + 9^2 = 144 + 81 = 225
zatem
I AB I = p( 225) = 15
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p(5) - pierwiastek kwadratowy z 5