Question

area of the shaded portion in the adjoining figure​

Answer 1

Answer:

264 cm2 is the correct answer

Answer 2

Answer:

Let the required increase = x cm

⇒π(10+x)2×4=π×102×(4+x)

100+x2+20x=25(4+x)

x2+20x+100=100+25x

x2−5x=0

x−5=0

x=5

∴ Required increase = 5 cm