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BECE Mathematics 2021 Paper
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© africaexams.com
Question : 12
Total: 40
The area of a rectangle is
18
cm
2
. If one of its sides is 2 cm long, find its perimeter.
18
cm
20
cm
22
cm
36
cm
Validate
Solution:
Area of a rectangle
=
length
×
breadth
=
L
×
B
Let
L
=
2
and
B
=
?
From the question the area is
18
cm
2
L
×
B
=
18
But
L
=
2
2
×
B
=
18
Divide both sides by 2
Perimeter of a rectangle
=
L
+
L
+
B
+
B
=
2
L
+
2
B
L
=
2
and
B
=
9
Perimeter
=
2
×
2
+
2
×
9
=
4
+
18
=
22
cm
© africaexams.com
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