1. en madrid, la oferta de arte es muy limitada. cierto / falso.
2. en el triángulo dorado de los museos hay tres museos muy importantes de madrid. cierto / falso.
3. en la obra las meninas de velázquez, la perspectiva es muy real. cierto / falso.
4. el museo reina sofía está dedicado al arte contemporáneo y antiguo. cierto / falso.
5. el lienzo guernica de picasso es pequeño. cierto / falso.
6. la colección del museo thyssen era privada y luego fue donada (donated) al estado español.
7. el greco era español. cierto / falso.

Explanation:

1. En Madrid, la oferta de arte es muy limitada.  falso.

There are many museums in Madrid, forty four, to be precise. So the art can never be limited in this amazing city.

But, there are three out of this big number, that are exceptional.

They are called a '' Golden Triangle '' because they are located near each other. The Triangle consists of: Museo del Prado, Reina Sofia and Thyssen.

2. En el Triángulo dorado de los museos hay tres museos muy importantes de Madrid. cierto

As I said in the first questions, this is very true.  They are located in the city center, in the Paseo del Prado.

3. En la obra Las Meninas de Velázquez, la perspectiva es muy real. cierto

The perspective looks real. Up to this day, the explanation and meaning of this piece of art, remains anonymous. Everybody sees it from their point of view.  It was very important for the Baroque era and it was handed from the Royal family to the Museum del Prado.

4. El Museo Reina Sofía está dedicado al arte contemporáneo y antiguo. falso. It's dedicated to the contemporary art, only. It opened in 1992 and consists of many pieces of art from the 20th century. It's located in the city center of Madrid and is named after Queen Sofia.

5. El lienzo Guernica de Picasso es pequeño. falso

That is not true because the canvas of Guernica is pretty big.It is 3.5 meters tall and 7.8 meters wide. It is considered to be one of the most important artworks of the history because it represented all the horrific events that Spanish people went through during the Nazi bombing while the Civil war was taking place.

6. La colección del Museo Thyssen era privada y luego fue donada (donated) al estado español. cierto

That is true. Thyssen museum was a private collection and a home to the Thyssen family. The place itself and all the famous artwork belonged to them, as well. Eventually, it was opened in 1992 and everybody could go there and admire one-of-a-kind artwork.

7. El Greco era español.  falso.

El Greco was an artist that came from Greece, that's why the nickname El Greco. He was born in Heraklion, in 1541 and died in Toledo in 1614. He belonged to the renaissance era in Spain, and was a very respected sculptor, painter and architect.