| ACUTE ANGLE |
ACUTE TRIANGLE |
ADJACENT ANGLE |
| An angle that measures less than 90 degrees. |
A triangle with three acute angles. |
Two angles that share a vertex and a side
(a ray) but have no interior points in common. |
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| ADJACENT ARCS |
ALTERNATE EXTERIOR ANGLES |
ALTERNATE INTERIOR ANGLES |
| Two arcs that share an endpoint and nothing else. |
Two nonadjacent exterior angles that lie
on opposite sides of a transversal |
Two nonadjacent interior angles that lie on opposite sides of a transversal. |
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| ALTITUDE OF A PYRAMID |
ANGLE |
ANGLE BISECTOR |
A segment from the vertex (apex)
perpendicular to the base. |
A figure formed by two rays with a common endpoint. |
A ray that divides an angle into
two congruent angles. |
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| ANGLE OF DEPRESSION |
ANGLE OF ELEVATION |
APOTHEM |
The angle formed below the horizon with
the line of sight (Down). |
The angle formed above the horizon
with the line of sight. (Up) |
A segment from the center of a regular polygon perpendicular to a side of the polygon. |
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| ARC ADDITION |
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| The sum of two adjacent arcs. |
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