In this page curved surface area solution4 we are going to see solution of some practice questions.

**Question 8**

The external surface area of a
hollow cylinder is 540 Π cm².Its internal diameter is 16 cm and height
is 15 cm. Find the total surface area.

**Solution:**

External surface area of cylinder = 540 Π cm²

2 Π R h = 540 Π cm²

Internal radius (r) = 16/2 = 8 cm

height (h) = 15 cm

2 **x** Π **x** R **x** h = 540 Π

2 **x** Π **x** R **x** 15 = 540 Π

= 540 Π** x** (1/2) **x** (1/Π) **x** (1/15)

= 270/(15)

R= 18

Total surface area = 2 Π (R + r) (R - r + h)

= 2 Π (18 + 8) (18 - 8 + 15)

= 2 Π (26) (25)

= 1300 Π cm²

**Total surface area of the cylinder = ****1300 Π cm² **

**Question 9**

The external diameter of the cylindrical shaped iron pipe is 25 cm and its length is 20 cm. If the thickness of the pipe is 1 cm, find the total surface area of the pipe.

**Solution:**

External radius of the pipe (R) = 12.5 cm

height of the pipe (h) = 20 cm

thickness of the pipe (w) = 1 cm

To find total surface area of the cylinder we have to find the internal radius (r)

W = R - r

1 = 12.5 - r

r = 12.5 - 1

r = 11 .5 cm

Total surface area = 2 Π (R + r) (R - r + h)

= 2 Π (12.5 + 11.5) (12.5 - 11.5 + 20)

= 2 (22/7) (24) (21)

= 2 (22) (24) (3)

= 3168 cm²

curved surface area solution4 curved surface area solution4

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- Area
- Curved Surface Area
- Total Surface Area
- Volume
- Cylinder
- Conoid (Cone)
- Sphere
- Problems on Curved Surface Area
- Problems on Total Surface Area
- Problems on Volume
- Formulas For Shapes
- Perimeter of Sector
- Perimeter of Sector Worksheets
- Length of Arc
- Practice questions on length of arc
- Perimeter of square
- Perimeter of Parallelogram
- Perimeter of Rectangle
- Perimeter of a Triangle
- Area of a Circle
- Area of Semicircle
- Area of Quadrant
- Area of a Sector
- Area of a Triangle
- Area of Equilateral Triangle
- Area of Scalene Triangle
- Area of Square
- Area of Rectangle
- Area of Parallelogram
- Area of Rhombus
- Area of Trapezium
- Area of Quadrilateral
- Area Around Circle
- Path Ways
- Combined Figures