1. What is the plural of vertex?
Vertices. A triangle has three vertices (corners) .
2. What is the difference between an ALTITUDE and a MEDIAN in a triangle?
An ALTITUDE is a line from a vertex which meets the opposite side (or its extension) at right angles.
A MEDIAN is a line from the vertex to the mid-point of the oppsoite side.
3. What is the difference between SIMILAR triangles and CONGRUENT triangles ?
SIMILAR triangles have the same shape but different size.
CONGRUENT triangles are the same shape and same size.
4. Is the longest side of a triangle always opposite the biggest angle?
Yes, and the SMALLEST angle is always opposite the SHORTEST side.