What 2 things do you always need to say to describe an enlargement?
The Scale factor and centre of enlargement.
What does centre of enlargement mean?
The point on the grid on which the lines connected to the outer points of the triangle meet and then expand from that point.
What is a scale factor?
The scale factor is the number of times bigger you have enlarged the shape.
Explain how to work out the scale factor on a grid, and with no grid. Use diagrams you have screenshot from the myimaths lesson.
On a grid, you can look at the number of square on at least 1 angle of the shape, then, (as an example) you double each side and if it is the same as the enlarged square then you know your scale factor would be 2.
What happens to the angle sizes in the corner of the shape when you enlarge it?
Nothing, on a triangle they always have to add up to 180°
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