Explanation -:
1) Find the curved surface area of a cylinder with the height and radius 4 CM and 7 CM respectively.
[tex] \underline{\small\bf Solution}[/tex]
In this question we are provided with the radius of a cylinder and a height of the cylinder. We are asked to calculate the curved surface area of the cylinder.
We know,
Curved surface area = 2πrh
Where,
- r stand for radius
- h stand for height
- Assuming π as 3.14
Substituting the values we get
Curved surface area = (2 × 3.14 × 4 × 7) cm²
→ Curved surface area = (6.28 × 28) cm²
→ Curved surface area= 175.84 cm²
- Hence the curved surface area of the cylinder is 175.84 cm²
2) Find the circular surface area of the cylinder when the radius is 14 CM.
[tex] \underline{\small\bf Solution }[/tex]
In this question we are provided with the radius of the cylinder. We are asked to calculate the area of the cylinder.
We know,
Area of a cylinder = πr²
Where,
- r stand for radius
- Assuming π as 3.14
Area = (3.14 × 14²) cm²
→ Area = 3.14 × 14 × 14
→ Area = 615.44cm²
- Hence the area of the cylinder is 615.44 cm²
3) Find the circular surface area of the cylinder when the diameter is 7CM.
[tex] \underline{\small\bf Solution}[/tex]
In this question we are provided with the diameter of the cylinder. We are asked to calculate the area.
First we will calculate the radius
Radius = Diameter/ 2
Substituting the values we get
Radius = 7/2 cm
Radius = 3.5 cm
Now we will calculate the area of the cylinder
We know,
Area of the cylinder = πr²
Area = 3.14 × 3.5²
→ Area = 3.14 × 3.5 × 3.5
→ Area = 38.465 cm²
- Hence the area of the cylinder is 38.465 cm².
