Page 102 - PortalToEnglish_2_SB_SE

1 CLIL: Maths

Area and perimeter 1 cm

side c
5 cm
A Look at the square on the graph
paper on the right. What do you side a area = side d
think area and perimeter refer to? 5 cm 25 cm 2 5 cm
Do you know how to find them?
perimeter =
5 cm
side b 20 cm
side b

B Look at the square again. Which of the following ways can you use to find the area and perimeter? Tick.
© MM Publications
To ind the perimeter of a square: To ind the area of a square:
count the number of small squares count the number of small
around the outside of the square. squares inside the square.
multiply (x) the lengths of side a
add (+) the lengths of side a, side b, and side b together.
side c and side d together.
count the number of squares
take the length of one side and multiply (x) around the outside of the square
it by 4. and divide (÷) it by 2.

C Now look at the rectangle and the triangle below. Using what you’ve just learnt, can you find the area
and perimeter of each one? Fill in the correct numbers in the spaces below.

c
8 cm
a d perimeter = cm + cm + cm + cm = cm
4 cm 4 cm
area = cm x cm = cm 2
b
8 cm

a c
5 cm 7 cm perimeter = cm + cm + cm = cm
cm x cm
area = = cm 2
b 2
5 cm

REMEMBER
TIP! If you can’t work out
the area, just count the
squares on the inside
This triangle is
exactly half a of the shape.
c
square. Find the a 7 cm
area of the square 5 cm
irst and then
divide (÷) it in half.
b
5 cm

100

100-108_PortalToEnglish2_SERBIA_SB_Culture_Cross.indd 100 3/1/2019 3:51:25 µµ