# Maths – Thursday 25th February (Zoom at 2pm to mark the worksheet)

Today’s lesson is about finding the perimeter of rectilinear shapes.

A rectilinear shape is a shape that has straight sides and right angles. It can look like two rectangles have been joined together.

This shape looks much more complicated than a rectangle, but the method of working out the perimeter is the same. Add together the lengths of all sides to find it.

Pause and rewind the video whenever you need to.

Here is the worksheet to answer at different times during the video.

**CHALLENGE**

Investigate this question about the perimeter of rectilinear shapes.

maths:

1. 22cm

b. 25cm

2. 36cm

3. a. 10cm 2cm I don’t really know

b. 34cm

4. a. 30cm

b. 34cm

5. a. yea he’s right

b. 22cm 24cm

6. no because just work out the last few

7. 16m

b. 1m?

Good effort Kiran

The ones to check are:

1b, 3a (use the other sides to work out the missing ones), 4a, 5a, 5b (second shape), 7b.

1) a) 22cm b) 26cm

2) 36cm

3) a) 9cm and 3cm b) 34cm

4) a) 30cm b) 24cm

5) a) NO 26cm b) 22cm 24cm

6) Yes, without the bottom side labeled you wouldn’t be able to do the side under the top

7) a) 16m b) 20m

Good effort Franek.

The ones to check are:

4a, 5b (second shape), 6, 7b.

36 cm?

Which question is this for Rihanna?

1. 21, 26

2. 36

3. 9cm, 3cm-34cm

4. 36cm, 29cm

5. Yes, 16+16 as 8+8.

6. Yes, because the information won’t let you find the perimeter and the sides.

7. 16, 24

Challenge

36cm because the sizes are very small.

Well done Hargun.

The ones to check are:

1a, 5a-c, 6.

worksheet: it wot let me print the sheet.

challenge: done

Ok. You can still work from the screen. I will also add the worksheet images to see if that helps.

Mr Bushell

1)

5+5+9+1+7+3+=30

2)

28mm

3)

26-13=13

4)

57=66-9

2+3+3+2+5+5=20cm

7+6+4+5+3+1=31cm

2+3+5+5+7+8=30cm

14+9+6+10+3+4=46cm

5+5+5+5+3+3=26

For the questions on perimeter (not the Get Ready section):

Check that you have worked out the length of each side and added them together carefully.

Mr Bushell

1a 22 cm b 26cm

2 36 cm

3 9 and 3 B 34 cm

4 a 36 cm b 34 cm

5 no b 26 cm

6 no

You probably know these are right because we just did them together on the Zoom!

Next time, make sure you’ve had a go first. It’s not a problem if you get them wrong – we learn from our mistakes.

Maths work sheet

1.a.=22cm

b.=26cm

3.=36cm

4.a.=36cm

b.34cm

5.a.=36cm

b.=21 and 24

6.=No

7. I don’t know a and b.

Hello Mia.

The ones to check are:

Q3, 5 a and b.

For Q7, the measurements for the flower bed are in the writing and question. You will need to find it and then use it correctly. Give it a go!

Mr Bushell

maths

1.

A) 22cm

B) 26 cm

2.

36cm

3.

3cm and 9cm

4.

a) 30 (added the 9 cm on)

b) 29 (added the 10 cm on)

5.

Mo is not correct

a)the perimeter is 26 cm.

B) they are both 26 cm

6.

Dani is correct

7.

a) 16 m

b) 24 m

Well done Owen.

Check question 4 (a and b), 5a and 6.

Mr Bushell

I sent mine by email did u receive it and was it correct

Yes Finlay, all received and all correct!