An oblique cylinder is a type of cylinder where the 2 bases are parallel but not directly aligned to each other. It is just a tilted or a slanted cylinder having its sides not perpendicular to the 2 bases.
Thus the sides of an oblique cylinder lean over at an angle that is not 90°. An oblique cylinder is thus exactly opposite to a right cylinder. The diagram given below is that of an oblique cylinder with its height (h) and radius (r) compared to a right circular cylinder.
Oblique Cylinder
Let us now learn about the volume of an oblique cylinder, how they are calculated with solved examples.
Formulas
Volume
The volume of an oblique cylinder is the space occupied by the cylinder in the three-dimensional plane. It is same as the volume of a right circular cylinder having the same height. Similar to a right cylinder it is measured in cubic units such as m3, cm3, mm3, ft3.
The formula to calculate the volume of an oblique cylinder is given below:
Volume of Oblique Cylinder
As we know,
Volume (V) = Base area of cylinder × height of cylinder
= (π × r2) ×h
= πr2h
Let us solve an example to understand the concept better.
Find the volume of a slanted cylinder whose radius is 11 inches and height is 24 inches. (Use π = 3.141).
Solution:
As we know, Volume (V) = πr2h, here π = 22/7 = 3.141, r = 11 in, h = 24 in = 3.141 × 11 × 11 × 24 = 9121.464 in2
Surface Area
Like a right circular cylinder, an oblique cylinder also has two types of surface areas. They are discussed below with formulas and solved examples.
Lateral (Curved) Surface Area
The lateral or the curved surface area (LSA) of a cylinder is the area formed by the curved surface of the cylinder. It is thus the space occupied between the two parallel circular bases. The formula to calculate the LSA of an oblique cylinder is given below:
Lateral (Curved) Surface Area of Oblique Cylinder
Let us solve an example to understand the concept better.
Calculate the curved surface area of the oblique cylinder with a radius of 5 cm and a length of 15 cm.
Solution:
As we know, Curved Surface Area (CSA) = 2πrl, here π = 3.141, r = 5 cm, l = 15 cm = (2 × 3.141) × 5 × 15 = 471.15 cm2
Total Surface Area
The total surface area (TSA) of an oblique cylinder is the area occupied by the entire cylinder. It includes the area of 2 circular bases and 1 curved surface. The formula to calculate the TSA of an oblique cylinder is given below:
Total Surface Area of Oblique Cylinder
Let us solve an example to understand the concept better.
The radius of a slanted cylinder is 11 ft. Find the total surface area of the cylinder with a length of33 ft.
Solution:
As we know, Total Surface Area (TSA) = l + 2πr2, here l = 33 ft, π = 3.141, r = 11 ft = 33 + (2 × 3.141 × 11 × 11) = 33 + 760.122 = 793.122 ft2
