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Subjects
Mathematics State Board
Class 7
Measurements
Circumference of a Circle
1.
One mark exercise problems
Exercise condition:
4
m.
1
. Formula used to find the
circumference
of a circle is
\(\pi r^2 \ sq. \ units\)
\(\pi r^3 \ cu. \ units\)
\(2 \pi r \ units\)
\(\pi r^2 + 2r \ units\)
2
. In the formula, \(C = 2 \pi r\), '\(r\)' refers to
circumference
radius
rotation
area
.
3
. If the circumference of a circle is \(82 \pi\), then the
value
of '\(r\)' is
21 cm
20 cm
82 cm
41 cm
.
4
.
Circumference
of a circle is always
less than three times of its diameter
more than three times of its diameter
three times of its diameter
three times of its radius
.
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