# Enlargement 2

## Activity

1) Change the parameter value sf by moving the point on the slider with your finger. What happens to the shape when the scale factor (sf) is: i) 2 ii) 3 iii) 4 iv) 5 v) 1/2 vi) 1/4? Draw and write down your observations on the worksheet provided. Challenge: what happens if the scale factor (sf) is i) -2 ii) -1/2? Draw and write down your observations. 2) Change the sf to 3. Now try moving the COE point (red dot) from the point: i) (-3, 5) ii) (9, 5) iii) (8, -4). Draw and write down your observations on the worksheet provided. Draw in ray lines using a dotted line to check the position of your enlargement. 3) Investigation: Challenge Set the COE to (0, 0) and the sf to 6. i) Name some other COE points so that the WHOLE purple shape can be seen on the grid (Hint: move the red dot around). ii) Name some other COE points which would NOT make the WHOLE purple shape visible. iii) If the COE is (-2, -1), what is the largest scale factor (whole number) that could be used to ensure that the whole purple shape can be seen on the grid?