Pi is a constant value which cannot be changed by any one. The pi symbol is denoted by as .The fractional value of pi is 22/7 and its equivalent decimal value is 3.142…Using the value of pi the absolute value of area of a circle can be calculated.When solving the given problem with pi value as a fraction then the result is also in fraction.Example problem – PI as a fraction:Example 1 – PI as a fraction: Finding the Area of a Circle whose radius is 7cm and Value of pi as a fraction.`Pi`.alue of pi in fraction = `22/7`. Volume of hemisphere = `2/3*pi*r^3`. = `2/3 *22/7 * 9^3.`. =`396/7cm^3.`. Example 6 – PI as a fraction: Find the surface area of a hemisphere whose radius is 12cm. Solution: Given that the radius of the hemisphere is 9cm.