Question

Find the change in the area of the circle if the radius of the circle is tripled

Answer 1

Answer:

Let the radius of the circle be x

then area of the circle=or

=πx²

if the radius is tripled

=3(x)

then the area becomes=π(3x)²

=9πx²

increase in the percentage of area

=9πx²/x²

=9

so the area of circle increases by 9 times.

Hope it works................................™✌️✌️

Answer 2

Answer:Let the radius of original circle be r.

∴ Area of the circle =πr

2

Now, radius becomes tripled i.e., 3r

Thus, area of the new circle =π(3r)

2

=9πr

2

=9×(original area).

Step-by-step explanation: