Question

The ratio of the circumference and diameter of a circle is 22:7 .If the length of the diameter of the circle is 2m 1dcm , let's calculate its circumference? ​

Answer 1

Answer:

here's the answer of the question

Answer 2

6.6 m

Step-by-step explanation:

Given:

Circumference: Diameter = 22 : 7

Diameter = 2 m 1 dcm

To Calculate:

Circumference

Solution:

This question is related to Ratio and Proportion or Circle. Whatever ....

We don't to find the radius. We can solve it in just a snap.

Diameter(d) = 2 m 1 dcm

= 2.1 m

let, The circumference be x m .

According to question,

$\frac{c}{d} = \frac{22}{7} \\ \\ c = d \times \frac{22}{7} \\ \\ c = 2.1 \times \frac{22}{7} \\ \\ c = \frac{ \cancel{21}}{10} \times \frac{22}{\cancel{7}} \\ \\ c = \frac{3 \times 22}{10} \\ \\ c = \frac{66}{10} \\ \\ c = 6.6$

Therefore, The Length of circumference is 6.6 m.

Concept of π

What is π ? π is a irrational no. that can be expressed as the ratio of circumference and diameter of a circle. In terms of fraction it mainly used as 22/7 which a approximate value.