Question

a) If the radius of a circle is doubled, find the total increase in its area.

b) Find the probability of getting a prime number on throwing a fair dice.


d) A library has a fixed fine of 20 on any delay in returning of a book. Additionally, it also
charges 3 on each day of delay. If Rahul paid 32 as fine, express the total fine as an
equation.

e) Find the value of x if- + + = -1.
2​

Answer 1

Answer:

Answer:Area of a circle = pi * square of radius. and pi is constant. Thus we can say that the the of a circle is directly proportional to the square of the radius of the circle. This means, if the radius of the circle is doubled, then the area of the circle will increase by 2^2 = 4 times, i.e. quadrupled.