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BECE Mathematics 2016 Paper
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© africaexams.com
Question : 28
Total: 40
Find the area of a circle whose diameter is 7 cm . [Take
π
=
22
7
]
11
cm
2
38
1
2
cm
2
44
1
2
cm
2
54
cm
2
Validate
Solution:
Area of a circle
=
π
r
2
Area of a circle
=
π
×
r
×
r
Radius is half of the diameter
Radius
=
7
2
π
=
22
7
Area of circle
=
22
7
×
7
2
×
7
2
Note: 2 divides itself once and 22, 11 times and the 7 at the denominator cancels one of the 7 s at the numerator
Area of circle
=
11
×
7
2
=
77
2
=
38
1
2
© africaexams.com
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