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det ( 0...2)(-2..0)= 0+4 = 4
L'= --> x^2 +y^2 - 4x + 4y - 6= 0
(x-2)² +(y+2)² = 6+4+4 = 14
r² =14
Luas L' = πr² = 14 π
Luas L = L'/ det =14 π/4 = 3,5 π
11.
(X,Y) -->x = a , x = b --> (x', y')
(x', y' ) = (2b -(2a -x))., (y)
x' = 2(b-a) + x
y' = 0 + y
dalam bentuk matriks
x' = |1..0|| x| + 2 |b- a|
y' |0..1|| y| | 0 |