A cylinder has no corners. So, the correct option is D. None. Let’s break this down and understand why that’s the case.
Step-by-Step Explanation:
🔍 What is a Corner (Vertex) in Geometry?
In geometry, a corner (also called a vertex) is a point where two or more edges or lines meet. For example:
- A cube has 8 corners.
- A pyramid has 5 corners (4 at the base and 1 at the top)
🧊 Let’s Examine the Number of Corners in a Cylinder
A cylinder is a 3D solid with 2 circular faces (top and bottom), and 1 curved surface connecting those faces. Furthermore, it has 2 edges, where the curved surface meets the circular bases. But a cylinder has 0 corners because no two edges meet at a point. There are no sharp turns or intersecting lines in a cylinder – everything is smooth and rounded.
| Features | Description |
| Faces | 2 circular faces + 1 curved surface |
| Edges | 2 |
| Corners | 0 |
📐 Related Formulae of Cylinder (For Reference):
- Curved Surface Area (CSA) of a Cylinder = 2rh
- Total Surface Area (TSA) = 2rh+r
- Volume = r2h
🔢 Let’s Revisit the Options
The question is: The number of corners in a cylinder is
(a) 1
(b) 2
(c) 3
(d) None
Since a cylinder has no corners, the correct answer is:
✅ Option (d) None
Understanding the basic properties of 3D shapes is essential, especially for geometry and surface area/volume problems. Confusing edges with corners is a common mistake. Always remember:
- Vertices (corners) are sharp meeting points.
- Cylinders and spheres are smooth, with no corners.
Common Doubts in Math
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