Το ύψος του τοίχου είναι δύο μέτρα.

The wall's height is two meters.

Breakdown of Το ύψος του τοίχου είναι δύο μέτρα.

• είμαι: to be
• δύο: two
• ο τοίχος: the wall
• το μέτρο: the meter

Questions & Answers about Το ύψος του τοίχου είναι δύο μέτρα.

Why is ύψος used with το even though it ends in -ος? I thought -ος nouns were usually masculine.

That is a very common point of confusion. In Greek, noun endings often give you a clue about gender, but they do not determine it by themselves.

Ύψος is a neuter noun, so its article is το: το ύψος.

There are quite a few neuter nouns ending in -ος, for example:

• το μέρος
• το λάθος
• το έδαφος

So it is best to learn Greek nouns together with their article:

• το ύψος
• ο τοίχος
• το μέτρο

That way, you automatically learn the gender too.

What does του mean here? Is it his?

Here, του does not mean his.

In του τοίχου, του is the genitive singular definite article, so the phrase means of the wall.

So:

• ο τοίχος = the wall
• του τοίχου = of the wall

It is true that του can also mean his in other contexts, but here it is clearly the article because it comes directly before the noun τοίχου.