Question

The circular base of a table lamp has a radius of 9 centimeters. What is the base’s circumference ?

(Use 3.14 for pi)

Answer 1

• Circumference of base is 56.52 cm

Explanation:

In this question we have given that radius of circular base of table lamp is 9 cm . And we are asked to find the circumference of base that means we have to find the circumference of circle .

We know that :

`\qquad\underline{\boxed{\frak{{Circumference_((Circle)) = 2\pi r }}}}`

Where ,

• π refers to 3.14

• r refers to radius of circle

Solution : -

Now we are finding the circumference of circle by putting value of radius as 9 and value of π as 3.14 in the formula .

`\longrightarrow \qquad \: 2 * 3.14 * 9`

`\longrightarrow \qquad \:6.28 * 9`

`\longrightarrow \qquad \: \orange{\underline{\boxed{\frak{56.52 \: cm}}}}`

• Therefore , circumference of base of a table lamp having radius 9 cm is 56.52 cm .

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Answer 2

56.52 cm

Explanation:

Since the circular base has radius of 9 cm. Therefore the base’s circumference is:

`\displaystyle \large{C=2\pi r}` where r is radius and C is circumference.

Input r = 9 in:

`\displaystyle \large{C=2\pi \cdot 9}\\\displaystyle \large{C=18\pi}`

Since π is given to be 3.14:

`\displaystyle \large{C=18\cdot 3.14}\\\displaystyle \large{C=56.52}`

Therefore, the base’s circumference is 56.52 cm