---
title: Μάθημα μαθηματικών 13
description: Μάθετε τις βασικές έννοιες στο μάθημα μαθηματικών 13. Εξηγήσεις για μελέτη και εξάσκηση.
url: https://astra-ai.co/el/videos/epipedi-geometria/trigono/what-is-a-triangle/
locale: el
type: video-lesson
keywords:
  - μάθημα μαθηματικών
published: 2026-10-01T20:02:51.059Z
updated: 2026-10-01T20:02:51.059Z
alternates:
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  my: https://astra-ai.co/my/videos/my-d640810d/my-851a9d39/my-6bf35d7d/
  lo: https://astra-ai.co/lo/videos/lo-d640810d/lo-851a9d39/lo-6bf35d7d/
  th: https://astra-ai.co/th/videos/plane-geometry/bot-19-samliam/botrian-013/
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  sl: https://astra-ai.co/sl/videos/ravninska-geometrija/trikotnik/kaj-je-trikotnik/
  pt: https://astra-ai.co/pt/videos/geometria-plana/triangulo/o-que-e-um-triangulo/
  fi: https://astra-ai.co/fi/videos/tasogeometria/kolmio/mika-on-kolmio/
  el: https://astra-ai.co/el/videos/epipedi-geometria/trigono/what-is-a-triangle/
  cs: https://astra-ai.co/cs/videos/rovinna-geometrie/trojuhelnik/co-je-trojuhelnik/
  bg: https://astra-ai.co/bg/videos/ploska-geometriya/triagalnik/kakvo-e-triagalnik/
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  sk: https://astra-ai.co/sk/videos/rovinna-geometria/kapitola-014/lekcia-013/
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  ja: https://astra-ai.co/ja/videos/plane-geometry-ja/ja-chapter-14/013/
  ko: https://astra-ai.co/ko/videos/plane-geometry-ko/14/013/
---

# What is a Triangle?

> Μάθετε τις βασικές έννοιες στο μάθημα μαθηματικών 13.