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If you mean the vertex where the two equal sides of an isosceles triangle intersect, the side is the base.

Q: What is the side opposite the vertex angle of an isoscles?

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a right angle

The base

It is the angle opposite the given side of a figure (<CAB has Vertex of A because it is the tip of the moutain, which is the highest point)

Not necessarily. The only time that the angle bisector would bisect the opposite side is if you were bisecting the vertex angle of an isosceles triangle.

An altitude.

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a right angle

The base

It is the angle opposite the given side of a figure (<CAB has Vertex of A because it is the tip of the moutain, which is the highest point)

A median is a line drawn from the centre of a side of a triangle to the opposite vertex. Only in two cases does it also bisect the angle :- 1) All three medians of an equilateral triangle bisect the angle of the opposite vertex. 2) One median (from the unequal side to the enclosed angle of the two equal sides) bisects the angle of the opposite vertex.

Not necessarily. The only time that the angle bisector would bisect the opposite side is if you were bisecting the vertex angle of an isosceles triangle.

An altitude.

A right angle triangle perhaps

A median of a triangle is a line or segment that passes through a vertex and the midpoint of the side opposite that vertex. The median only bisects the vertex angle from which it is drawn when it is an isosceles triangle.

The hypotenuse of a right angle triangle is opposite to its right angle of 90 degrees.

An angle cannot "share" a vertex and a side.

Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).

A triangle is not a segment joining a vertex and the midpoint of the side opposite the vertex.