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Browse all Honors Geometry Key Terms

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(x1, y1)
(x2, y2)
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δabc ≅ δdef
π
π (pi)
∆abc
∠
∠a ≅ ∠d
∠abc
≅
1:1:√2 ratio
1:√3:2 ratio
30-60-90 triangle
30-60-90 triangle theorem
45-45-90 triangle
45-45-90 triangle theorem

A

A = πr²
A square is a rectangle and a rhombus
AA Similarity
Aa similarity criterion
AA Similarity Postulate
AA Similarity Theorem
AAA Congruence
AAS
AAS Theorem
Ab
Acute angle
Acute angles in a 30-60-90 triangle
Acute triangle
Acute triangle centroid properties
Adding areas
Addition of Vectors
Adjacent Angles
Adjacent side
Algebraic proof
All angles are right angles in rectangles
All sides are congruent in rhombuses
Alternate exterior angles
Alternate interior angles
Alternate interior angles theorem
Altitude
Altitude Proportion
Altitude Theorem
Angle
Angle Addition Postulate
Angle between vectors
Angle Bisector
Angle Bisector Theorem
Angle deficit
Angle diagrams
Angle Inequality
Angle of depression
Angle of elevation
Angle of rotation
Angle of rotation theorem
Angle Sum Property
Angle Sum Theorem
Angle-side relationship
Angular Defect
Apothem
Applications in trigonometry
Arc Length
Arc length formula
Arccosine
Archimedes
Architectural design
Architecture
Arcsine
Arctangent
Area
Area Formula
Area of a Circle
Area of a kite