Learning Objectives
Grade D
To be able to explain how to enlarge a 2D shape by a whole number scale factor.
Can you explain the effect of enlargement on lengths and angles?
Grade C
To be able to demonstrate enlarging a 2D shape by a fractional scale factor.
How can an enlargement make an object smaller?
Grade B
To be able to demonstrate enlarging a 2D shape by a negative scale factor.
What is the effect of a negative scale factor?
Resources
Grade D
Ask the class to draw a quadrilateral within a 3x3 square
Pick a point above and to the left of this shape
Illustrate drawing enlargement lines from this point for each of the four corners
Ten Ticks - 7-8, 4, 35 (print)
MEP 14, pages 22-25
Introduce the idea of fractional enlargement using the Maths4Real video
Grade C
Introduce Fractions Enlargement
Ten Ticks - 7-8, 4, 35 (print)
Homework
Learning Objectives for next lesson:
Grade D
To be able to demonstrate how to rotate a 2D shape about a point.
Can you list the process of rotating a shape?
To be able to demonstrate how to reflect 2D shape in a line x=a or y=b.
Can you explain your method?
Grade C
To be able to demonstrate translating a 2D shape by a vector.
Can you explain vector notation?
To be able to demonstrate reflecting a 2D shape in the line y = x or y = -x.
Can you describe your method?
