Simple Secrets of Mathematics for all examinations

20.How many centimetres are there in a meter?
Ans.100 centimetres
21.What is the value of the golden ratio, often denoted by the Greek letter φ (phi), rounded to two decimal places?
Ans. Approximately 1.62
22.How many faces, edges, and vertices does a cube have?
Ans. A cube has 6 faces, 12 edges, and 8 vertices.
23.What is the formula to find the area of a circle?
Ans. Area = πr^2 (where r is the radius)
24.What is the value of the natural logarithm of e (ln(e))?
Answer: 1
25.How many radians are there in a full circle?
Ans.2π radians
26.What is the value of the square root of 2, rounded to two decimal places?
Ans. Approximately 1.41
27.What is the formula to find the surface area of a sphere?
Ans. Surface Area = 4πr^2 (where r is the radius)

28. What is the sum of the interior angles of a regular polygon with n sides?
    Ans. (n-2) * 180 degrees
29. What is the value of the cube root of 64?
    Ans. 4
30. What is the formula to find the volume of a cylinder?
    Ans. Volume = πr^2h (where r is the radius and h is the height)
31. What is the value of 10 factorials (10!)?
    Ans.3628800
32. How many diagonals does a hexagon have?
    Ans. 9 diagonals
33. What is the formula to find the area of a triangle given the lengths of its three sides (a, b, and c)?
    Ans. Area = √(s(s-a) (s-b) (s-c)), where s is the semi-perimeter (s = (a + b + c) / 2)
34. What is the value of the square root of 3, rounded to two decimal places?
    Ans. Approximately 1.73
35. How many degrees are there in a straight angle?
    Ans. 180 degrees
36. What is the value of 2 to the power of 10 (2^10)?
    Ans. 1024
37. How many sides does a decagon have?
    Ans. 10 sides
38. What is the formula to find the volume of a cone?
    Ans. Volume = (1/3) πr^2h (where r is the radius of the base and h is the height)
39. What is the value of the cube root of 125?
    Ans.5
40. What is the formula to find the perimeter of a circle?
    Ans. Perimeter = 2πr (where r is the radius)