Find the circumference of a circle having radius 7 cm. Use π=22/7.
44 cm
To find the circumference of a circle, we use the formula:
\(C = 2 \pi r\)
where \(C\) is the circumference, \(\pi\) is a constant approximately equal to 3.14159, and \(r\) is the radius of the circle.
In this question, we are given:
- Radius \((r) = 7 \, \text{cm}\)
- \(\pi = \frac{22}{7}\)
Substituting these values into the formula, we get:
\(C = 2 \times \frac{22}{7} \times 7\)
First, simplify the multiplication:
- \(\frac{22}{7} \times 7 = 22\) (since the 7's cancel out)
Therefore, the calculation becomes:
\(C = 2 \times 22 = 44 \, \text{cm}\)
Hence, the circumference of the circle is 44 cm.
This corresponds to the correct option.
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Important Questions from Mensuration
In a circular garden of radius 15 m, a path of 2 m wide has to be made inside the garden at the rate of ₹ 24 per sq. m. The cost of making the path is: (Take π = \(\frac{22}{7}\) )
A hollow cylinder with outer radius 4 cm and height 2 cm is made up of 1 cm thick metal sheet. What is the volume of metal used? (Take π = \(\frac{22}{7}\))
The sides of a triangular park are 60 m, 297 m and 303 m. Its area is equal to the area of a square-shaped garden. What is the perimeter (in m) of the garden?
The length and breadth of a rectangular field are in the ratio 4 : 3. If the cost of cultivating the field at ₹2 per m 2is ₹600, then the length of the field is:
A cylindrical tank has a capacity of 5632 m3. If the diameter of its base is 8 m, what is the depth of the cylindrical tank? (Use π = \(\frac{22}{7}\))
