Enlargement  To perform an enlargement we need two pieces of information.  The Scale Factor…  … and the centre of enlargement.  Enlargement doesn’t.

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Presentation transcript:

Enlargement  To perform an enlargement we need two pieces of information.  The Scale Factor…  … and the centre of enlargement.  Enlargement doesn’t always mean that the shape will get larger.  If the scale factor is greater than 1, the new image will be larger than the original.  If the scale factor is less than 1, the new image will be smaller than the orginal.

Scale Factor greater than 1  Enlarge shape A by scale factor 2, centre (0,1). x y A Steps 1)Locate the centre of enlargement 2)Draw a line from the centre through a corner 3)Measure the length of the line from the centre to the corner 4)Multiply this length by the scale factor 5)Redraw the line so that it is now the new length 6)Repeat for all corners and draw new shape B

Scale Factor less than 1  Enlarge shape A by a scale factor 2/3, centre (-2,-2) x y A B Steps 1) Locate the centre of enlargement 2) Draw a line from the centre through a corner 3) Measure the length of the line from the centre to the corner 4) Multiply this length by the scale factor 5) Mark on the line the new length 6) Repeat for all corners and draw new shape