area of a circular cylinder pf 10 r 9 h times 3.14
To find the area of the circular cylinder with a radius of 9 and a height of 10, we first need to find the area of the two circular bases and the lateral surface area.
1. The area of each circular base can be found using the formula for the area of a circle: A = πr^2
Area of one base = π(9)^2 = 81π
2. The lateral surface area of the cylinder can be found using the formula: A = 2πrh
Lateral surface area = 2π(9)(10) = 180π
3. The total area of the circular cylinder is the sum of the two circular bases and the lateral surface area:
Total area = 2(81π) + 180π = 162π + 180π = 342π
Therefore, the total area of the circular cylinder with a radius of 9 and a height of 10 is 342π square units.