**Decimal places of pi:**

**Pi** is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to
the square of its radius. It is approximately equal to 3.141593 in the usual decimal notation.

Pi decimal places are 3.14.

Pi also denoted in fraction = `22 / 7` Source: wiki

**Decimal places of pi problem 1:**

Find the area of circle using decimal places of pi, radius of circle is 4cm.

**Solution:**

Given that radius of circle – 4cm

Formula for area of circle is = pi r ^2

Where pi = 3.14

R = 4cm

Substitute the value into the formula

= 3.14 * 4 * 4

42 is equal to 4 * 4 = 16

= 3.14 * 16

= 50.24

Area of the circle is = 50.24

**Decimal places of pi problem****: 2**

** **Find the volume on the given sphere which has the radius of 5 centimeter.

** Solution:**

Given the radius of the sphere is 5 centimeter.

The formula used to find the volume of the sphere is =` 4/3` pi r 3.

By plugging in the given values in to the formula we get

Volume = `4/ 3` pi (5)^{3}

5^{3} can be written as 125.

** ** Volume = `4/ 3`
pi 125.

By simplifying it

= `500 /3` pi.

=` (500 ( 3.14 ) )/ 3`

= 1570 / 3

Volume = 523.33

**Decimal places of pi problem****: 3**

** **Find the volume on the given sphere which has the radius of 8 centimeter.

**Solution:**

Given that radius of the sphere is 8 centimeter.

The formula used to find the volume of the sphere is = `4/3` pi r 3.

By plugging in the given values in to the formula we get

Volume = `4/ 3` pi (8) ^{3}

6^{3} can be written as 512.

** ** = `4/
3` (3.14) 512.

By simplifying it

= `4 / 3` (1607.68)

= `6430.72 / 3`

= 2143.57

**Decimal places of pi problem****: 4**

Find the surface area of the sphere that the radius of 7 centimeter.

**Solution:-**

Given the radius of the sphere is 7 centimeter.

The formula used to find the surface area of the sphere is = 4 pi r ^ 2.

By plugging in the given values in to the formula we get

Surface area = 4 pi (7)^{2}.

7^{2} can be written as 49.

= 4 pi 49.

By simplifying it we get the answer as

= 196 (3.14).

Surface area = 615.44

**Decimal places of pi problem****: 5**

Find the surface area of the sphere that the diameter of 12 centimeter.

**Solution:-**

Given the diameter of the sphere is 12 centimeter.

The radius is half of the diameter.

So radius is 12/ 2 = 2

r =6

The formula used to find the surface area of the sphere is 4 pi r ^{2}

By plugging in the given values in to the formula we get

Surface area = 4 pi (6)^{2}.

6^{2} can be written as 36.

= 4 pi 36.

By simplifying it we get the answer as

= 144 (3.14).

Surface area = 452.16