Perimeter of Rectilinear Shapes
To calculate the perimeter of rectilinear shapes.
1) Calculate the perimeter of these shapes. Show the calculation you did
to find the answer.
a
Shapes
not drawn
to scale
b
6cm
6cm
4cm
2cm
2cm
8cm
7cm
4cm
4cm
5cm
8cm
2cm
Calculation:
Calculation:
3cm
c
10cm
d
5cm
5cm
7cm
7cm
7cm
13cm
8cm
2cm
10cm
Calculation:
3cm
Calculation:
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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Perimeter of Rectilinear Shapes
2) In these shapes there is a missing side. Calculate the length of the missing side and then
work out the perimeter. Show the calculation you used for the missing side and also
the perimeter.
5cm
8cm
a
b
3cm
7cm
5cm
5cm
7cm
4cm
3cm
10cm
Missing side:
Missing side:
Perimeter:
Perimeter:
c
8cm
d
8cm
3cm
2cm
6cm
5cm
6cm
3cm
3cm
3cm
Missing side:
Missing side:
Perimeter:
Perimeter:
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Perimeter of Rectilinear
Shapes Answers
1)
a) perimeter = 32cm
b) perimeter = 26cm
c) perimeter = 34cm
d) perimeter = 46cm
2)
a) missing side = 10cm
perimeter = 36cm
b) missing side = 11cm
perimeter = 42cm
c) missing side = 5cm
perimeter = 26cm
d) missing side = 2cm
perimeter = 28cm
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Perimeter of Rectilinear Shapes
To calculate the perimeter of rectilinear shapes.
1) Calculate the perimeter of these shapes. Remember to order the side
measurements in a way that makes the calculation easier to complete.
a
Shapes
not drawn
to scale
b
10cm
3cm
7cm
4m
6cm
3cm
4m
6m
6m
12m
8m
12m
3cm
16m
Calculation:
Calculation:
2) Use the squared paper to draw a rectilinear shape which has a perimeter of 30. Label the
length of the sides and show the calculation which makes a perimeter of 30.
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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Perimeter of Rectilinear Shapes
3) Farmer Fred is putting a fence around the outside of one of his fields.
He has written the measurements of most of the sides, but has
forgotten to write down the measurement of one side.
Calculate the measurement of the missing side, then work out how
much fencing he will need to buy a fence to go around the whole field.
7m
Shapes
not drawn
to scale
Calculation:
10m
17m
12m
7m
4) Calculate the missing sides in these shapes, then work out the perimeter.
6cm
a
b
20cm
7cm
18cm
16cm
22cm
30cm
12cm
4cm
Calculation:
24cm
Calculation:
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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Perimeter of Rectilinear
Shapes Answers
1)
a) 32cm
b) 68cm
2) Multiple answers possible. An example answer:
6
1
4
1
5
8
3
2
3) missing side = 19m
fencing required = 72m
4)
a) missing side = 15cm
perimeter = 84cm
b) missing side = 18cm
perimeter = 108cm
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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Perimeter of Rectilinear Shapes
To calculate the perimeter of rectilinear shapes.
1) Draw three rectilinear shapes made up of three rectangles
measuring 3cm in length and 2cm width. The shapes need to
have different perimeters. One has been done to show you.
3cm
1cm 3cm
2cm
3cm
3cm
4cm
3cm
perimeter = 22cm
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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Perimeter of Rectilinear Shapes
2) In these rectilinear shapes, some sides are not shown. Some shapes also
have more than one missing side. Calculate the missing side(s) and
then the perimeter.
a
Shapes
not drawn
to scale
12cm
b
28cm
4cm
4cm
12cm
24cm
18cm
9cm
16cm
30cm
Missing side(s):
Missing side(s):
Perimeter:
Perimeter:
6cm
c
d
6m
6m
16m
14cm
10cm
16m
4cm
Missing side(s):
Missing side(s):
Perimeter:
Perimeter:
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
10m
6m
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Perimeter of Rectilinear
Shapes Answers
1) Multiple possible answers. An example given in the question.
2)
a) missing side = 8cm
perimeter = 72cm
b) missing side = 15cm
perimeter = 108cm
c) missing sides: 10cm and 16cm
perimeter: 60cm
d) missing sides: 10m and 6m
perimeter: 76m
Maths | Measurement | Perimeter | Lesson 3 of 3: Perimeter of Rectilinear Shapes
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