Question

find the percentage of prime number from 1 to 20​

Answer 1

Answer:

Circumference of circle: The distance around the circular region is called its circumference. The ratio of circumference of any circle to its diameter is constant. This constant is denoted by π and is read as pie.

Circumference/Diameter = Pie

i.e., c/d = π or c = πd

We know that diameter is twice the radius, i.e., d = 2r

C = π × 2r

⇒ C = 2πr

Therefore approximate value of π = 22/7 or 3.14.

Answer 2

Answer:

The prime numbers between 1 & 20 are

2,3,5,7,11,13,17,19

Percentage of prime numbers in the numbers from 1 to 20

=820×100

=8×5

=40%