Basic Shapes |

acute angle |
An is an angle whose measure is greater than 0° and less
than 90º. acute
angle |

acute triangle |
An is a triangle that has three acute angles.acute
triangle |

<1 and <2 are adjacent <1 and <ABC are not adjacent |
share a common vertex, a common side and no common
interior points (they do not overlap).Adjacent
angles |

Altitude for an obtuse triangle. |
The
is a line segment extending
from any vertex of a triangle perpendicular to the line containing
the opposite side. altitude of a triangle |

An is a ray whose endpoint is the vertex of the angle
and which divides the angle into two congruent angles.
angle
bisector
| |

is any line (or subset of a line) that
intersects the segment at its midpoint.Bisector
of a line segment | |

<1 and <2 are complementary |
are two angles the sum
of whose measures is 90º. (Complementary angles need Complementary angles not be adjacent angles.) |

congruent angles |
are angles of the same
measure.Congruent angles |

are segments of the same
length (measure).Congruent segments | |

congruent triangles |
are triangles whose
corresponding angles and sides are congruent. (They are
exactly the same size and shape.)Congruent triangles |

equiangular triangle |
An
is a triangle which has three
congruent angles.equiangular triangle |

equilateral triangle |
An
is a triangle with three
congruent sides.equilateral triangle |

isosceles triangle |
An
is a triangle with two congruent
sides.isosceles triangle |

linear pair |
A linear pair
of angles are adjacent
angles whose non-common sides are opposite rays (form a straight
line). The sum of the measures of the angles in a linear pair
is 180º. Unlike supplementary angles, a linear pair
MUST be two adjacent angles. |

The
is a line segment extending from
any vertex of a triangle to the midpoint of the opposite side.median of a triangle | |

is the point on that line segment that
divides the segment two congruent segments.Midpoint
of a line segment | |

The
is a line (or
subset of a line) that bisects the segment and is perpendicular to
the segment.perpendicular bisector of a segment | |

obtuse angle |
An
is an angle whose measure is greater than
90º and less than 180º.obtuse angle |

obtuse triangle |
An
is a triangle which contains one
obtuse angle.obtuse triangle |

are two lines which
intersect to form right angles.Perpendicular lines | |

right angle |
A is an angle whose measure is 90º.right
angle |

right triangle |
A is a triangle containing one right angle.right
triangle |

scalene triangle |
A
is a triangle with no congruent
sides.scalene triangle |

straight angle |
A
is an angle whose measure is
180º.straight angle |

<1 and <2 are supplementary |
are two angles the sum
of whose measures is 180º. (Supplementary angles need Supplementary anglesnot be adjacent.) |

<1 and <3 are vertical angles <2 and <4 are vertical angles |
are two nonadjacent angles formed by two intersecting
lines.Vertical
angles |

Form of equation: | Formula: | ||

Standard Form | ax + by = c | ||

Slope Intercept Form/ Y Intercept Form | y = mx + b | m = slope b = y intercept | |

X Intercept Form | x = (y - b)/m | b = y intercept m = slope | |

Point-Slope Form | y - y_{1} = m(x - x_{1})
| (x_{1},y_{1})m = slope |