Answer:
28.27cm³
Step-by-step explanation:
Area of a circle:

First, find the area of a full circle with this given radius:

Now, to find the radius of a quarter circle with the same radius, just divide by 4:

The radius of the quarter circle is about 28.27cm³
Answer:
0.3 per year
Step-by-step explanation:
Number of newborn per year: 200*0.5 = 100
Number of death per year: 200*0.2= 40
So, the difference between birth and death = 100-40 = 60 (people)
and the growth rate during the year is: 60/200 = 0.3
<em>Hope this answer will find you well. </em>