- Isaiah 17 is the seventeenth chapter of the Book of Isaiah in the Hebrew Bible or the Old Testament of the Christian Bible. This book contains the prophecies attributed to the prophet Isaiah, and is one of the Books of the Prophets. The New King James Version describes this chapter as a “proclamation against Syria and Israel”.
- Obtuse triangle (Wikipedia)
An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle’s angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.