demostración

1. demonstration
2. proof

es

• Verb

  third-person singular present indicative of ser

• Noun

en

1. in, at, on
2. in (a time)
3. in (a language)
4. used after some verbs and translated by various prepositions in English
5. in (in various expressions)

el

masculine singular definite article; the

caso

• Noun

  1. case (situation or fact)
  2. case (instance of a medical condition)
  3. case
  4. case
  5. occasion

• Verb

del

of the, from the (+ a masculine noun in singular).

círculo

circle

inscrito

past participle of inscribir