If a planar graph has 11 vertices and four times as many edges as faces, how many faces does it have? Is there a planar graph with 13 vertices that has three times more edges than faces?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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**Question:**
- If a graph is planar and has \( n \) vertices, can it have two vertices of degree \( n-1 \)? Can it have three vertices of degree \( n-1 \)? Justify your answer.
Transcribed Image Text:**Question:** - If a graph is planar and has \( n \) vertices, can it have two vertices of degree \( n-1 \)? Can it have three vertices of degree \( n-1 \)? Justify your answer.
**Question:**
If a planar graph has 11 vertices and four times as many edges as faces, how many faces does it have? Is there a planar graph with 13 vertices that has three times more edges than faces?

**Explanation:**
This question involves understanding the properties of planar graphs and using the Euler's formula for planar graphs, which is:

\[ V - E + F = 2 \]

where \( V \) represents the number of vertices, \( E \) represents the number of edges, and \( F \) represents the number of faces.

For the first part:
- Given: \( V = 11 \) and \( E = 4F \).

For the second part:
- Given: \( V = 13 \) and \( E = 3F \).
Transcribed Image Text:**Question:** If a planar graph has 11 vertices and four times as many edges as faces, how many faces does it have? Is there a planar graph with 13 vertices that has three times more edges than faces? **Explanation:** This question involves understanding the properties of planar graphs and using the Euler's formula for planar graphs, which is: \[ V - E + F = 2 \] where \( V \) represents the number of vertices, \( E \) represents the number of edges, and \( F \) represents the number of faces. For the first part: - Given: \( V = 11 \) and \( E = 4F \). For the second part: - Given: \( V = 13 \) and \( E = 3F \).
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