Question

The ratio of the radii of the two wheels is 4: 5. Find the ratio of their circumference. (a)5:4
a} 5:4

(b)4:5

(c)16:25

(d)25:16

Answer 1

Answer:

(D) - 25:16

Step-by-step explanation:

Let the radius be x,

therefore,

Area = pie x (4x)² : pie x (5x)²

Therefore ,

Area = 16x² : 25x² (pie , pie get cancelled)

Therefore,

Area = 16:25

Answer 2

Given:

We have The ratio of the radii of the two wheels is 4: 5.

To Find:

We need to find the ratio of their circumference.

Step-by-step explanation:

• Let the radius of two school be 4x and 5x.

• We know circumference of circle is given by the formula 2$\pi$r

• Thus cicumference of one circle will be

                  $2\pi r=2\pi (4x)$

• And circumference of other circle will be

                  $2\pi r=2\pi (5x)$

• Ratio of circumference of two circle is given by

                  $\frac{2\pi (4x)}{2\pi (5x)} =\frac{4}{5}$

Thus,ratio of their circumference will be 4:5