Chapter 11 Geometry Vocabulary

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47 Terms

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point
exact location (GPS)
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line
atleast two points, and continues forever in both directions
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line segment
part of a line you can measure
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ray
you know where it starts and it continues in one direction
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angle
when two rays share a common end point (vertex)
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vertex
end point
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sides
consists of line segments
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degree
a unit of measure for angles
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right
exactly 90 degrees
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acute
less than 90, but greater than 0
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obtuse
bigger than 90, but less than 180
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straight
measures 180
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plane
flat surface that extends forever in all directions (floor, wall)
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parallel lines and perpendicular lines
continues forever in both directions, lie in same plane, same distance apart, never intercept, and same slope
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skew lines
don’t lie in the same plane, and don’t intercept
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**c**omplementary lines
2 angles = 90 (c, 90) (c before s, and 90 before 180)
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**s**upplementary lines
2 angles = a straight line (180) (s after c, 180 after 90)
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acute triangles
all angles are less than 90
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right triangles
one angle is 90 (makes a square at the corner)
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obtuse triangles
one angle greater than 90
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equilateral triangles
all sides are the same length (60 each) (60 x 3 = 180) (3 sides = triangle)
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isosceles triangles
two sides that are exactly the same length + angles have same measurements
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scalene triangles
every side has a __different measure__, __usually__ __one line__ is __obtuse__
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Congruent Statement
Ex: ABC = XYZ
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Corresponding Parts
a = x | b = y | c = z | ab = xy | bc = yz | ac = xz
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transversal
crosses at least two parallel lines and forms special angles
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alternate interior angles
inside parallel lines
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alternate exterior angles
angles that are outside of parallel lines, and alternate on transversal
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corresponding angles
angles that lie on same location, but on different lines
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similar triangles
the measures of corresponding angles are equal, and the measures of corresponding sides are proportional
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congruent
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quadrilateral
4-sided figure (360 total degrees)
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parallelogram
two pairs of parallel sides, opposite sides are equal, have to have 360
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rectangle
two pairs of parallel sides, all angles are 90 degrees (a square can be a rectangle, but a rectangle cannot be a square)
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square
two pairs of parallel sides, all sides are congruent, all sides are 90 degrees (a square can be a rectangle, but a rectangle cannot be a square)
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rhombus
all sides have same measure, two pairs of parallel sides (equal)
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pentagon
five-sided figure (total degree = 540)
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he__**x**__agon
si__**x**__-sided figure (total degree = 720)
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heptagon
seven-sided figure (total degree = 900)
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octagon
eight-sided figure (total degree = 1080)
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__**n**__o__**n**__agon
__**n**__i__**n**__e-sided figure (total degree = 1260)
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__**deca**__gon
ten-sided figure **(decade)** (total degree = 1440)
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dodecagon
twelve-sided figure (total degree = 1800)
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trapezoid
one pair of parallel sides
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total degree formula
(n - 2)180 (n = amount of triangles formed)
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regular polygon formula
find total degree, then divide by the sides | **Ex: 900 / 7 = 128.7 for every angle**
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adjacent angles
angles in a transvertical that are across from each other