Year 5

# Identifying missing coordinates of shapes

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## Lesson details

### Key learning points

- In this lesson, we will find the missing coordinates for a vertex of a shape using knowledge of the other vertices.

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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

Which of the following happens when a shape is reflected by a line of reflection along the x-axis?

The reflected shape has the same y coordinate as the original shape

The shape is translated to the left

The shape is translated to the right

Q2.

If a shape is reflected by a line of reflection along the x axis then which of the following is correct?

Both the x and y coordinates of the reflected shapes must change

Both the x and y coordinates of the reflected shapes must stay the same

The y coordinate will definitely stay the same

Q3.

If a triangle has the coordinates (1,3), (1,4), (2,3) and after a transformation becomes (1,-3), (1,-4) and (2,-3), which if the below have happened?

The triangle has been reflected onto the y-axis

The triangle has been translated down

The triangle has been translated up

Q4.

If a triangle which has the coordinates (1,-1), (1,-3) and (3,-3) is reflected by a line of reflection along the y-axis, what will it's new reflected coordinates be?

(-1,1), (-1,3), (-3,3)

(-1,1), (1,3), (3,3)

(1,-1), (1,-3), (3,-3)

Q5.

A triangle with coordinates (-2,-2), (-2,-4) and (-4,-4) is reflected first by a line of reflection along the x-axis, and then reflected by a line of reflection along the y-axis, what will the new coordinates be?

(-2,2) (-2,4) (-4,4)

(2,2) (-2,4) (4,4)

(2,2) (2,4) (-4,4)

### 5 Questions

Q1.

Which of the following statements is correct?

I must have all 4 coordinates of the vertices of a square

If I have 3 out of 4 coordinates of the vertices of the square, then I cannot find the last one

If I have the coordinates of 1 of the vertices of a square, then I can find the coordinates of the remaining three vertices

Q2.

(5,4), (9,8) and (5,8) are the coordinates of three vertices of a square, what are the coordinates of the last?

(4,5)

(8,5)

(9,5)

Q3.

(1,-10), (9,-10) and (9,-4) are the coordinates of three vertices of a rectangle, what are the coordinates of the last?

(-4,10)

(1,-10)

(1,4)

Q4.

(-4,6) and (-2,8) are the coordinates of two vertices of a square, what are the coordinates of the remaining two vertices?

(-2,-6) (-4,-8)

(-4,-2) (6,8)

(2,6) (4,8)

Q5.

(7,6) and (13,3) are the coordinates of two vertices of a right angled triangle, what are the two possibilities of the coordinates of the third?

(13,-3) or (7,-6)

(7,13) or (13,6)

(7,3) or (0,0)