Explanation:
Let the radius of circle be r
Area of circle =
�
�
2
πr
2
Area of circle =
3.14
×
�
2
3.14×r
2
We are given that an area of 78.5 square inches
So,
3.14
×
�
2
=
78.5
3.14×r
2
=78.5
�
2
=
78.5
3.14
r
2
=
3.14
78.5
�
2
=
25
r
2
=25
�
=
25
r=
25
r=5
Hence The radius of circle is 5