High School

The circumference of the hub cap of a tire is 73.66 centimeters. Find the area of this hub cap. Use 3.14 for \(\pi\).

1. Calculate the area of the hub cap. (Round the final answer to the nearest whole number. Round all intermediate values to the nearest thousandth.)

2. If the circumference of the hub cap were smaller, explain how this would change the area of the hub cap.

Enter your answer in the answer box.

Answer :

Answer:

432 square centimeters

Step-by-step explanation:

Given :

The circumference of a hub cap is = 73.66 cm

The circumference of a circle is given as = 2πr, where r is the radius of the circular hubcap.

So , 2πr = 73.66

⇒ [tex]$r=\frac{73.66}{2 \times \pi}$[/tex]

⇒ [tex]$r=\frac{73.66}{2 \times 3.14}$[/tex] (Using, π = 3.14)

⇒ r = 11.73 cm

Therefore the area of the hub cap is given by A = [tex]$\pi r^2$[/tex]

A = [tex]$3.14 \times 11.73 \times 11.73$[/tex]

= 432 [tex]$cm^2$[/tex]

If the circumference of the hubcap were smaller, the area of the hubcap would be smaller too, since the circumference of the hubcap is proportional to the radius which is proportional to the area too.