中ちゅう点てん連れん結けつ定てい理り

noun

midpoint theorem

A theorem in geometry stating that the segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.

• 中ちゅう点てん連れん結けつ定てい理りを使つかって、三さん角かく形けいの辺へんの長ながさを求もとめる。

  Use the midpoint theorem to find the length of a side of the triangle.