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27 terms

MathVoclessons1-7

Geometry lessons 1-7
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intersection
point where two or more lines cross
equilateral
triangle with 3 equal sides
corresponding
angles in the same position at different points of a figure
protractor
tool used to draw or measure angles
ray
set of points that is part of a line; has an endpoint and extends
vertex
common point to both sides of an angle
acute
angle smaller than 90 degrees
vertical
pairs of opposite angles; have the same measure
right triangle
triangle with a 90 degree angle
supplementary
two angles whose sum of their measures is 180 degrees
straight
angle measuring 180 degrees
isosceles
two of the sides in a triangle are the same
equiangular
triangle with 3 equal angles, measuring 60 degrees
interior
angle within a polygon
acute triangle
a triangle with all 3 angles less than 90 degrees
obtuse triangle
triangle with one obtuse angle
obtuse
larger than 90 degrees
adjacent
angle that shares a vertex and a common side with another angle
right
a 90 degree angle
complementary
two angles whose sum of their measures is 90 degrees
exterior
angle formed by extending one side of a polygon at a vertex
scalene
all the sides of a triangle have different lengths
congruent
having the same size and shape
similar
figures that have the same shape but not the same size
quadrilaterals
polygons with 4 sides and 4 angles
diagonal
a line that connects two vertices that are not next to each other
regular polygon
polygon with all equal sides and angles