11 1 21 L O To plot shapes

11. 1. 21 L. O – To plot shapes on a grid, write coordinates and translate and reflect shapes. Today’s lesson is an assessment of all you have done last week. So there is no video but I will go through the main points before you have a go at answering the questions.

Look at the grid below Remember the vertical axis is the y axis and the horizontal axis is the x axis. When we read and plot co-ordinates we move along the corridor x axis and up the stairs y axis. For example (4, 8) When you plot shapes onto a grid you need to know the coordinates of each vertex of the shape. A vertex is a corner. When we talk about more than one vertex we call them vertices.

Draw the grid into your book. Write the coordinates for the following shapes A-( , )( , ) B–( , )( , ) B A

Translating and reflecting shapes When we translate shapes we move them. We translate them up and down. Look at your grid. Translate shape A 7 up and 3 right. This means that we move each vertex 7 squares up and 3 squares to the right. Plot the translated shape and write the coordinates. When we reflect shapes the line that they are reflected in acts as a mirror line. Therefore the shape is the same shape and size but appear as if they are mirror reflections, with the right and left reversed. Reflect shape B on the x axis Plot the shape and write the coordinates of the reflected shape.

Answers Write the coordinates for the following shapes A - ( -9, -2 ) ( -4, -2 ) (-4, -7 ) (-9, -7 ) B – (3, 1 ) ( 4, 4 ) ( 8, 1) ( 9, 4 ) B Translated A (-6, 0) (-6, 5) (-1, 0) (-1, 5) A Reflected shape B (8, -1) (9, -4) (3, -1) (4, -4)