RRB Assistant Loco Pilot and Technician Model Paper 2 with solutions

Question : 15 of 75

Marks: +1, -0

If the radius of any circle is increased by two times then what will increase in its surface area?

Solution:

Area of circle = π

r^2

Now, area of circle = π

(2r)^ 2

= 4π

r^2

Area increased = 4π

r^2

– π

r^2

= π

r^2

Percentage increased area
=

{3πr^2}/{πr^2}

x 100 = 300%

Go to Question:

Prev Question

Next Question