SHEEBA JOHNK V PATTOM

SHIFT 1

CLASS VMATHS

AREA AND ITS BOUNDARY

Finding the Perimeter

SHEEBA JOHN

KVPATTOM,SHIFT1

Take a walk around the edge!Take a walk around the edge!

The perimeter is…The perimeter is…

60 cm !60 cm !

This shape has sides of 5 cm each

This shape has sides of 5 cm each

1515

3030

4545

6060

Take a walk around the edge!Take a walk around the edge!

The perimeter is…The perimeter is…

32 cm !32 cm !

This is a regular octagon with sides 4 cm

This is a regular octagon with sides 4 cm

44

88

1212 1616

2020

2424

28283232

Take a walk around the edge!Take a walk around the edge!

8cm8cm

10 cm

The perimeter is…The perimeter is…

26 cm !26 cm !8cm8cm

88

1616

2626

Take a walk around the edge!Take a walk around the edge!

6cm6cm

10 cm10 cm

The perimeter is…The perimeter is…

32cm !32cm !

661616

2222

3232

The farmer wants to re-build the rectangular goat pen, but has only 36m of fencing and cannot remember the exact dimensions from the first pen.

Can you help ?

Remember:

• the pen is rectangular

• only 36m of fence can be used

L.O. Investigating perimeter - finding all possibilities

A farmer has a goat pen which uses 36 m of fencing.

One night, during a storm, the goat pen is destroyed.

L.O. calculating area and perimeter

5.5 cm

10 cm

Find

area

55 cm² 30 cm²

15.5 cm² 25 cm²

L.O. calculating area and perimeter

6 cm

12 cm

Find

area

30 cm² 72 cm²

18 cm² 36 cm²

L.O. calculating area and perimeter

2 cm

4.5 cm

Find

area

18 cm² 13 cm²

32 cm² 9 cm²

L.O. calculating area and perimeter

4 cm

9 cm

Find

area

30 cm² 26 cm²

30 cm² 36 cm²

L.O. calculating area and perimeter

5 cm

10 cm

Find

area

30 cm² 50 cm²

15 cm² 25 cm²

L.O. calculating area and perimeter

3 cm

7 cm

Find perimeter

30 cm 21 cm

20 cm 10 cm

L.O. calculating area and perimeter

8 cm

12 cm

Find perimeter

30 cm 40 cm

128 cm 20 cm

L.O. calculating area and perimeter

2 cm

8 cm

Find perimeter

30 cm 16 cm

15 cm 20 cm

L.O. calculating area and perimeter

6 cm

11 cm

Find perimeter

14 cm 66 cm

55 cm 34 cm

L.O. calculating area and perimeter

5 cm

10 cm

Find perimeter

30 cm 50 cm

15 cm 25 cm

THANK YOU