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Appendix A Glossary
- \(A, B, C, \ldots\)
capital letters are points
- \(\overleftrightarrow{AB}\)
line containing points \(A\) and \(B\)
- \(\overline{AB} \)
line segment from \(A\) to \(B\)
- \(|AB| \)
length of line segment from \(A\) to \(B\)
- \(\|\vec{A}\| \)
magnitude of a vector
- \(\|A-B\| \)
distance from point \(A\) to point \(B\)
- \(\angle ABC \)
angle with rays meeting at \(B\)
- \(m\angle ABC \)
angle measure
- \(\Delta ABC \)
triangle with vertices \(A, B,\) and \(C\)
- \(A \cong B \)
objects \(A\)and \(B\) are congruent (may be line segments, angles, triangles).
- \(\overleftrightarrow{AB} \: \parallel \: \overleftrightarrow{CD} \)
lines are parallel
- \(\overleftrightarrow{AB} \: \perp \: \overleftrightarrow{CD} \)
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 \(\pi/2\)
- 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
