# Hyperbolic Geometry (Rectangles)

• SportsLover
In summary, using the fact that the interior angle sum for any triangle in hyperbolic geometry is less than 180◦, it can be proven that it is impossible to have a rectangle in hyperbolic geometry. This can be done by considering a four-sided figure and drawing a diagonal line to create two triangles, and using the fact that the interior angle sum for each triangle is less than 180◦. This shows that the sum of the angles in a rectangle cannot equal 360◦, therefore proving its impossibility in hyperbolic geometry.
SportsLover

## Homework Statement

1. Recall that in hyperbolic geometry the interior angle sum for any triangle is less than 180◦. Using this fact prove that it is impossible to have a rectangle in hyperbolic geometry.

## The Attempt at a Solution

- I wanted to use the idea that rectangles are 4 right angles meaning they would add up to 360 to help with the proof. I am not sure if that is useful, or even how I would write that in a proof.

Hi SportsLover:

Here is hint. Think about a four sided figure that you might want to test to see if it is a rectangle. Think about a diagonal line connecting two corners. You now have two triangles.

Hope this helps.

Regards,
Buzz

## 1. What is hyperbolic geometry?

Hyperbolic geometry is a non-Euclidean geometry that describes the properties of objects in a space with a constant negative curvature. In this geometry, the sum of the angles of a triangle is always less than 180 degrees and parallel lines never intersect.

## 2. What is a hyperbolic rectangle?

A hyperbolic rectangle is a four-sided figure with four right angles that exists in a hyperbolic space. Unlike in Euclidean geometry, the opposite sides of a hyperbolic rectangle are not equal in length and the angles formed between the sides are not congruent.

## 3. How is a hyperbolic rectangle different from a Euclidean rectangle?

A Euclidean rectangle exists in a flat, two-dimensional space and has two pairs of equal sides and four right angles. A hyperbolic rectangle exists in a space with a constant negative curvature and has two pairs of unequal sides and four angles that are less than 90 degrees.

## 4. Can a hyperbolic rectangle be constructed in the real world?

No, a hyperbolic rectangle cannot be constructed in the real world as it exists in a space with a constant negative curvature, which is not possible in our three-dimensional world. However, it can be represented and studied mathematically.

## 5. What are some applications of hyperbolic geometry?

Hyperbolic geometry has many applications in fields such as architecture, art, and physics. It is used to create unique designs in buildings, sculptures, and art pieces. It also has applications in the study of black holes and the universe, as well as in computer graphics and game development.

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