Question

If the circumference of a circle is
reduced by 50%, then the area
of the circle will reduce by –
(A) 25%
(B) 50%
(C) 65%
(D) 75 %

A train leaves Jorhat at 5 AM and
reaches Ghy at 11 AM. Another
train leaves Ghy at 5.30 AM and
reaches Jorhat at 11.30 AM.
What time the two trains cross
each other ?
(A) 8 AM
(B) 8.15 AM
(C) 8.30 AM
(D) None of these

Answer 1

Answer:

The answer is option D. 75%

Step-by-step explanation:

If the circumference is reduced by 50%, then the radius is also reduced by 50% .

If r is the initial radius of the circle ,then new radius is half of full i.e. r/2.

Similarly

Initial area A is πr^2 . New area is πr^2/4

= 25% of initial area.  

Thus there is a reduction of 75% area