Glossary

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Appendix A Glossary

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$A, B, C, \dots$: 🔗
capital letters are points
$\overset{\leftrightarrow}{A B}$: 🔗
line containing points $A$ and $B$
$\overset{―}{A B}$: 🔗
line segment from $A$ to $B$
$| A B |$: 🔗
length of line segment from $A$ to $B$
$‖ \vec{A} ‖$: 🔗
magnitude of a vector
$‖ A - B ‖$: 🔗
distance from point $A$ to point $B$
$∠ A B C$: 🔗
angle with rays meeting at $B$
$m ∠ A B C$: 🔗
angle measure
$Δ A B C$: 🔗
triangle with vertices $A, B,$ and $C$
$A ≅ B$: 🔗
objects $A$ and $B$ are congruent (may be line segments, angles, triangles).
$\overset{\leftrightarrow}{A B} ∥ \overset{\leftrightarrow}{C D}$: 🔗
lines are parallel
$\overset{\leftrightarrow}{A B} ⊥ \overset{\leftrightarrow}{C D}$: 🔗
lines are perpendicular
acute: 🔗
an angle with measure less than a right angle
circle: 🔗
set of points equidistant from a given point
complementary: 🔗
the angle sum is that of a right angle
line: 🔗
undefined term (see chair)
obtuse: 🔗
an angle with measure greater than a right angle
parallel: 🔗
two lines which do not intersect
perpendicular: 🔗
two line segments intersect in a right angle
plane: 🔗
undefined term (see table)
point: 🔗
undefined term (see mug)
right angle: 🔗
an angle with measure $π / 2$
supplementary: 🔗
the angle sum is that of two right angles
transversal: 🔗
a line crossing two other (typically parallel) lines
triangle: 🔗
the shape consisting of line segments connecting three, non-colinear points

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