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# Geometry Glossary - A a|b|c|d|e|g|h|i|k|l|m|o|p|q|r|s|t|v|x|y|

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# acute angle:

An angle with a measure less than 90.

# acute triangle:

A triangle with three acute angles.

# adjacent angles:

Two coplanar angles with one common side and a common vertex, but no common interior points.

# adjacent sides of a polygon:

Sides which intersect at a vertex.

# alternate interior/exterior angles:

Interior/ Exterior, nonadjacent angles which he on opposite sides of a transversal.

# altitude of a prism:

Any segment perpendicular to the planes containing the two bases with endpoints in these planes.

# altitude of a triangle:

A segment from a vertex of the triangle perpendicular to the opposite side.

# altitude of a trapezoid:

A perpendicular segment from any point on one base to the other base.

# angle:

Two rays with a common endpoint. The rays are the sides, the endpoint is the vertex.

# angle bisector:

A segment, line, ray, or plane which divides an angle into two con- gruent angles.

# apothem of a regular polygon:

The length of a perpendicular segment from the center of the polygon to a side.

# arc:

An unbroken part of a circle measured by referring to an angle whose vertex is the center of the circle.

# area of a circle:

The limit of the areas of inscribed regular polygons as the number of sides increases indefinitely.

# area of a polygon:

The number of square units in the region bounded.

Note: The terms in this collection may not be entirely accurate.
They are for reference only.