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37 terms

Geometry 5th Vocabulary

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Square
4 equal sides. 90 degree angles.
Rectangle
quadrilateral. 90 degree angles.
Quadrilateral
4-sided polygon
Perimeter
distance around a figure
Area
number of square units it takes to cover a figure
Right Angle
90 degree angle
Triangle
3-sided polygon
Acute Triangle
3-sided polygon, each angle is less than 90 degrees
Obtuse triangle
3-sided polygon, 1 angle greater than 90 degrees
Right Triangle
3-sided polygon. One 90 degree angle.
Isosceles Triangle
3-sided polygon. 2 congruent sides.
Equilateral Triangle
3-sided polygon. 3 congruent sides. 3 60 degree angles.
Scalene Triangle
3-sided polygon. No congruent sides
parallelogram
4-sided quadrilateral. 2 pairs of parallel lines
parallel lines
lines that will never intersect
trapezoid
4-sided quadrilateral. 1 pair of parallel lines
congruent
same size, same shape
rhombus
4-sided polygon with all congruent sides
segment
section of a line between two endpoints
vertex or vericies
the point where 2 lines meet
polygon
many-sided figure, closed, straight line segment
regular polygon
polygon with congruent sides and congruent angles
irregular polygon
polygon without all congruent sides
straight angle
angle measuring 180 degrees
complementary angles
angles whose sum equals 90 degrees
Supplementary angles
angles whose sum equals 180 degrees
regular polygon
a polygon with congruent sides and congruent angles
pentagon
5-sided polygon
hexagon
6-sided polygon
heptagon
7-sided polygon
octagon
8-sided polygon
nonagon
9-sided polygon
acute angle
an angle less than 90 degrees
obtuse angle
an angle more than 90 degrees
intersecting lines
lines that cross
perpendicular lines
lines that intersect and form 90 degree angles where they cross
angle
two rays that start from the same endpoint