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.
a
5
c) Find the value of a if
a+12
8
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
2
2
х
1.
1
e) Find the value of x it +
5
2​

Answer 1

Answer:

Let the radius of circle be r

So area = pie r^2

If radius is doubled then r = 2r

Area = pie (2r)^2

So ratio = 1:4

B) favourable outcomes = 2

probability = 2/6=1 /3

C) a = - 12