Berlawanan jarum jam berarti 90°, kalau searah jarum jam berarti -90° atau 270°
(ini make matriks)
(x', y') =
( cos a - sin a )( x - a ) (a)
( sin a cos a )( y - b ) + (b)
( 0 -1 )(-5) (2)
( 1 0 )( 9) + (-5)
(-9) (2)
(-5) + (-5)
=(-7,-10)
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Berlawanan jarum jam berarti 90°, kalau searah jarum jam berarti -90° atau 270°
(ini make matriks)
(x', y') =
( cos a - sin a )( x - a ) (a)
( sin a cos a )( y - b ) + (b)
( 0 -1 )(-5) (2)
( 1 0 )( 9) + (-5)
(-9) (2)
(-5) + (-5)
=(-7,-10)