Question

The diameter of a circle is 18 centimeters. What is the circle's circumference?

Answer 1

Answer:

Circumference ≈ 56.55

Step-by-step explanation:

Given:

• Diameter = 18 cm

To Find:

• The circumference of the circle

Solution:

Here we'll use the formula of finding the circumference,i.e :

$\boxed{\rm \: C = πd}$

• Here, d = diameter
• The value of π is not given, so let us take π = 3.14
• C = circumference

Substitute them onto the formula:

• d = 18 cm
• π = 3.14

$\rm C = \pi(18) \: cm$

$\rm C = 3.14 \times 18 \: cm$

$\boxed{\rm C \approx \: 56.55}$

Hence, the circumference of the circle is 56.55(approx).

Answer 2

Given :-

• Diameter = 18 cm

To Find :-

• Circumference = ?

$\qquad\rule{150pt}{2pt}$

Solution :-

☼︎ Radius of the Circle;

Using Formula:

$\red\bigstar {\underline{\boxed{\color{springgreen}{\textsf{ \textbf{ \: Diameter \: of \: circle= 2 \: ×\: r \: }}}}}}$

$\sf\implies Diameter = 2× r$

$\sf\implies 18 = 2× r$

$\sf\implies r = \frac{18}{2}$

$\sf\implies r = \cancel \frac{18}{2}$

$\sf\implies r = 9 cm$

$\qquad\rule{150pt}{2pt}$

☼︎ Circumference of the Circle;

Using Formula:

$\pink\bigstar {\underline{\boxed{\color{red}{\textsf{ \textbf{ \: Circumference \: of \: circle \: = \: 2 \: π\: r \: }}}}}}$

$\sf \implies \: Circumference \: = \: 2 \: π\: r$

$\sf \implies \: Circumference \: = \: 2 \: \times \: 3.14\: \times \: 9$

$\sf \implies \: Circumference \: = \: 2 \: \times \: 3.14\: \times \: 9$

$\sf \implies \: Circumference \: = \: 56. 52 \:cm$

$\qquad\rule{150pt}{2pt}$

henceforth, the circumference of the Circle is 56.52 cm...!!