Math Examples of Fractions

The formula for finding the total surface area of Right Circular Cone is given by:
TSA of a right circular cone = ⊼r (r + √ r² + h²);
Here ‘r’ is the radius of right circular cone and ‘h’ is the height of right circular cone.
Given, radius = 9 inch;
Height = 15 inch.
And we know that the value of ⊼ is 3.14;
TSA =?
On putting these values in the given formula we get the TSA of right circular cone.
TSA of a right circular cone = ⊼r (r + √ r² + h²);
TSA = 3.14 * 9 (9 + √ (9)² + (15)²;
TSA = 3.14 * 9 (9 + √ 81 + 225;
TSA = 3.14 * 9 (9 + √ 306;
TSA = 3.14 * 5(5 + 17.49);
TSA = 3.14 * 112.46;
TSA = 353.13; 
So the total surface area of right circular cone is 353.13 inch².