Across
- 2. if any two of its side are of the same length
- 4. an angle of 90°
- 6. if each one of its sides has the same length
Down
- 1. the perpendicular line segment from a vertex of a triangle to its opposite side
- 3. The line segment joining a vertex of a triangle to the mid point of its opposite side
- 5. a simple closed curve made of three line