Question

50

Question 10
A diagram has circles such that the area represents the populations of various
countries in the world. The circle for United States has a radius of 4.2 cm and the circle
for India has a radius of 8.7 cm. If 4% of the world's population is in United States, what
percentage of the world's population is in India? Round to the nearest percent.

Answer 1

Answer: 17%

Explanation:

So, the formula to get the area of a circle is
`\pi r^(2)`.

USA:
`4.2^(2) \pi` = 55.42cm

India:
`8.7^2\pi` = 237.79cm

From this, we can divide India by USA:

237.79 / 55.42 = 4.291

Then, with that we can multiply our 4% by 4.291:

4 * 4.291 = 17.16400

Rounded to the nearest percent is 17%