Question

the radii of two circle are 20cm and 30cm. find the difference between their circumference.
answer it guys it's urgent​

Answer 1

Step-by-step explanation:

‌‌For two circles -

Difference between their Circumference :

2πr(2) - 2πr(1)

2π { r(2) - r(1) }

2×22/7 × 10 cm

440/7 = 62.85 cm

Answer 2

Given :

• Radius of the first circle = 20 cm.
• Radius of the second circle = 30 cm.

To Find :

• Difference between the circumference of the circle.

Solution :

We have the radius of the two circle as 20 cm and 30 cm, respectively.

We have to calculate the difference between the circumference.

We know that circumference is calculated using : 2πr.

Let the radius of the bigger circle be R.

Let the radius of the smaller circle be r.

Let's begin.

$\sf{Circumference_{bigger\:circle}\:-\:Circumference_{smaller\:circle} }$

$\longrightarrow$ $\sf{2\:\pi\:R\:-\:2\:\pi\:r}$

$\longrightarrow$ $\sf{2\:\pi\:\times\:30\:-\:2\:\pi\:\times\:20}$

$\longrightarrow$ $\sf{2\:\pi\:(30-20)}$

$\longrightarrow$ $\sf{2\:\times\:\dfrac{22}{7}\:\times\:10}$

$\longrightarrow$ $\sf{\dfrac{44}{7}\:\times\:10}$

$\longrightarrow$ $\sf{\dfrac{440}{7}}$

$\longrightarrow$ $\sf{62.85}$

$\large{\boxed{\sf{\red{Difference\:between\:the\:circumference\:=\:62.85\:cm}}}}$