Question

2. An inner diameter of a car tyre is 3 3 5 cm and thickness of the type is 4 radius of the tyre? cm. What is the outer 3 cm 7​

Answer 1

From the given question the correct answer is:

the outer radius of the tire is 2.232cm or $\frac{4.464}{2}$cm.

Given :

inner diameter: $\frac{15}{4}$

thickness of the type:$\frac{5}{7}$

To find:

the outer radius of the tire

Solution:

we have to find outer radius of tire.

so ,

Outer Diameter = Inner diameter + Thickness of the tire

                           $=\frac{15}{4} +\frac{5}{7}\\\\=\frac{105+20}{28} \\\\=\frac{125}{28}\\\\=4.464cm$

Now , from the Outer diameter we can find the outer radious.

we know that, radius= 1/2 diameter

so, outer radius

$=\frac{1}{2} Outer diameter\\\\=\frac{1}{2} \times 4.464\\\\=2.232cm$

Hence , the outer radius of the tire is 2.232cm or $\frac{4.464}{2}$cm.

       

Answer 2

Given: radius of the tyre is 2.232 cm

• inner diameter = $\frac{15}{4}$

• the thickness of the tyre = $\frac{5}{7}$

To find the radius of the tyre

having a  formula for calculating the outer radius of the tyre = inner dia + thickness.

= $\frac{15}{4} +\frac{5}{7}$

= $\frac{105+20}{28}$

= $\frac{125}{28}$

= 4.464 cm

As we know that the radius is half of the diameter.

so,  

= $\frac{1}{2}*$outer diameter

= 2.232 cm

therefore the radius of tyre is 2.232 cm

or $\frac{4.464}{2}$ cm