1. altitude of a triangle A point in which the three altitudes of the triangle intersect. It is possible for the orthocenter to occur on the triangle, on the interior of the triangle or on the exterior of the triangle. 2. base angles The third, unequal side of an isosceles triangle. 3. base of an isosceles triangle A segment from a vertex to the midpoint of the opposite side. 4. centroid The two angles that include the base of an isosceles triangle. 5. median of a triangle A point on the interior of a triangle in which the three medians of the triangle intersect. 6. orthocenter A segment from a vertex perpendicular to the opposite side. 7. vertex angle The angle formed by the two equal sides of an isosceles triangle.

altitude - a segment from the vertex angle to the opposite side

base angles - the two angles that include the base of an isosceles triangle

Base of an isosceles triangle - the thirdunequal side of an isosceles triangle

Median of a triangle - a segment from a vertex to the midpoint of the opposite side

vertex angle - the angle formed by the 2 equal sides of an isosceles triangle

Centroid - a point in the middle of the triangle where the three median intersect

orthocenter - a point at which all three altitudes to intersect...

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and if you are on oddysseyware then you can just look in the learning section and there is a table that gives you all the answers