Question

Identify the difference of circumference of two concentric circles whose width is 3.5 CM.
A. 22cm
B. 20cm
C. 24cm
D. 26cm

Answer 1

Answer:

Difference of circumference of two concentric circles is 22 cm

Step-by-step explanation:

Let R and r be radii of the given two concentric cicles

Given:

Width = 3.5 cm

$\implies\;R-r=3.5$

$\text{Difference of their circumference}$

$=\bf\;2\pi\;R-2\pi\;r$

$=2\pi(R-r)$

$=2{\times}\frac{22}{7}{\times}3.5$

$=2{\times}\frac{22}{2}$

$=22\:\:cm$

Answer 2

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