National Pi Day, celebrated on March 14th each year, is a momentous occasion in the realm of mathematics. This day pays homage to the mathematical constant π, representing the ratio of a circle’s circumference to its diameter.

The significance of March 14th lies in its numerical representation – 3/14 – which corresponds to the first three digits of π, 3.14.

Originating globally, National Pi Day has evolved into a *celebration of mathematical curiosity* and ingenuity, inspiring enthusiasts of all ages. Pi has implications across various fields of science and mathematics.

*Below are the list of 20 questions with 4 options for each question, you can refer the answers for each question at the bottom of this article:*

#### 1. What is the approximate value of pi (π)?

a) 3.14

b) 2.71

c) 4.13

d) 1.62

#### 2. Who is credited with the first calculation of π?

a) Euclid

b) Archimedes

c) Pythagoras

d) Isaac Newton

#### 3. Which ancient civilization was the first to discover an approximation of pi?

a) Greek

b) Egyptian

c) Babylonian

d) Chinese

#### 4. What is the ratio of a circle’s circumference to its diameter?

a) π

b) 2π

c) π/2

d) 4π

#### 5. What mathematical constant is represented by the Greek letter π?

a) Phi (φ)

b) Delta (Δ)

c) Theta (θ)

d) Pi (π)

#### 6. Which famous mathematician proved that π is irrational?

a) Carl Friedrich Gauss

b) Leonhard Euler

c) Isaac Newton

d) Johann Carl Friedrich Gauss

#### 7. What is the formula to find the area of a circle?

a) A = πr^2

b) A = 2πr

c) A = 1/2πr

d) A = πr

#### 8. Which mathematician is often credited with the first use of the Greek letter π to represent the ratio of a circle’s circumference to its diameter?

a) Euclid

b) Pythagoras

c) Archimedes

d) Euler

#### 9. What is the value of pi (π) rounded to two decimal places?

a) 3.15

b) 3.12

c) 3.13

d) 3.14

#### 10. In what century did the use of the symbol π become popular?

a) 16th century

b) 17th century

c) 18th century

d) 19th century

#### 11. Which mathematician famously calculated π to many decimal places using a series expansion?

a) Isaac Newton

b) Gottfried Wilhelm Leibniz

c) Srinivasa Ramanujan

d) Leonhard Euler

#### 12. What is the circumference of a circle with a diameter of 10 meters?

a) 31.4 meters

b) 62.8 meters

c) 15.7 meters

d) 50.24 meters

#### 13. What is the diameter of a circle with a circumference of 20π meters?

a) 10 meters

b) 20 meters

c) 40 meters

d) 5 meters

#### 14. What is the formula to find the circumference of a circle?

a) C = 2πr

b) C = πr^2

c) C = π/d

d) C = 1/2πr

#### 15. Who introduced the concept of the number π as the ratio of the circumference of a circle to its diameter in his work “Measurement of a Circle”?

a) Euclid

b) Pythagoras

c) Archimedes

d) Aristotle

#### 16. What is the value of π squared (π^2)?

a) 6.28

b) 9.86

c) 9.42

d) 9.87

#### 17. Which of the following is an infinite series that converges to π?

a) 4/1 – 4/3 + 4/5 – 4/7 + …

b) 1 + 1/2 + 1/4 + 1/8 + …

c) 1 + 1/3 + 1/5 + 1/7 + …

d) 1 – 1/3 + 1/5 – 1/7 + …

#### 18. What is the ratio of the circumference of a circle to its radius?

a) 2π

b) π/2

c) 4π

d) π

#### 19. Which of the following formulas can be used to calculate the volume of a cylinder?

a) V = πr^2

b) V = πr^2h

c) V = 2πr

d) V = π/d

#### 20. What is the approximate value of pi (π) to 10 decimal places?

a) 3.1415926536

b) 3.141592654

c) 3.141592653

d) 3.1415926542

#### Answers:

- a) 3.14
- b) Archimedes
- c) Babylonian
- a) π
- d) Pi (π)
- d) Johann Carl Friedrich Gauss
- a) A = πr^2
- c) Archimedes
- d) 3.14
- a) 16th century
- b) Gottfried Wilhelm Leibniz
- b) 62.8 meters
- a) 10 meters
- a) C = 2πr
- c) Archimedes
- a) 6.28
- a) 4/1 – 4/3 + 4/5 – 4/7 + …
- a) 2π
- b) V = πr^2h
- a) 3.1415926536

Hope you liked the quiz!