inches in a foot
12
Mode
the number which occurs most frequently within a given set
Acute angle
measures less than 90 degrees
Acute triangle
each angle measures less than 90 degrees
obtuse angle
measures more than 90 degrees
obtuse triangle
one angle measures more than 90 degrees
Adjacent Angles
share a side and a vertex
Complementary angles
adjacent angles that sum to 90 degrees
supplementary angles
adjacent angles that sum 180 degrees
Vertical Angle
Angles that are opposite of each other. They are always congruent (equal in measure)
Equilateral triangle
all angles are equal
isosceles triangle
2 sides and 2 angles are equal
scalene
no equal angles
parallel lines
lines that will never intersect
perpendicular lines
lines that intersect or cross to form a 90 degree angle
Transversal line
a line that crosses parallel
bisector
any line that cuts a line segment, angle, or polygon exactly in half
polygon
any enclosed plane shape with three or more connecting side
regular polygon
has all equal sides and equal angles
arc
a portion of a circle's edge
chord
a line segment that connects two different points on a circle
tangent
something that touches a circle at only one point without crossing through it
sum of angles
the sum of angles of a polygon can be calculated using (n-1)180degrees, when n=the number of sides
the angles of a triangle adds up to...
180 degrees
area of a triangle
1/2 bh (base height)
Pythagoras' Theorem
a(square) +b (square) = c(square)
What is a trapeziod
4-sided polygon, where only the bases are parallel
Median of a trapezoid formula
m= 1/2 (a+b) a and b are the two bases
Area of a trapezoid formula
area= 1/2h (a+b) or mh
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