Question

The radius of one circular field is 5m and that of other is 3m . Find the radius of the circular field whose area is the difference of the area's of the first and second field.

Answer 1

Answer:

4

Step-by-step explanation:

general concept:

Circle area = $\pi$ x $r^{2}$

Circle prerimeter = 2 x $\pi$ x r

1. Circle 1 Area = $\pi$ x $5^{2}$ = 78.5

2. Circle 2 Area = $\pi$ x $3^{2}$ = 28.26

3. Diff area = 78.5 - 28.26 = 50.24

4. r = $\sqrt{Area/\pi }$ = $\sqrt{16}$ = 4