Question

one circle has radius of the 98 cm and second concentric circle has radius of 1m 26 and them how much longer is the circumference of the second circle than that of the first ?

Answer 1

Answer:

r = 98 cm

R = 1 m 26 = 126 cm

DIFFERENCE BETWEEN THE CIRCUMFERENCE OF TWO CIRCLES IS =

2πR - 2πr

OR , 2π ( R - r )

OR , 2 x 22/7 x ( 126 cm - 98 cm )

OR , 44/7 x (28 cm )

OR , 44 x 4 cm

OR , 176 cm

Answer 2

$\mathfrak{\huge{Answer:}}$

Given is the radius of two concentric circles as 98 cm and 1 m 26 cm respectively. And here, we need to find the difference between their circumferences.

Circumference of a circle = $\tt{2 \pi r}$

Let the radius of the circles be = r and R

Such that : r = 98 cm

R = 1 m 26 cm = 126 cm

The difference between their circumferences will be :-

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

We can here take $\tt{2\pi}$ common from both the terms. Doing so, we get :

=》 $\sf{2 \pi ( R - r )}$

Put the values in the formula and solve it further :-

=》 $\sf{2 \pi (126-98)}$

=》 $\sf{2 \times\frac{22}{7}\times 28}$

=》 2 × 22 × 4

=》 176 cm

That's the answer ! It's 176 cm.