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32 terms

geometery 7th Grade

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acute angle
An angle less than 90 degrees
right angle
an angle that measures 90 degrees
obtuse angle
An angle more than 90 degrees
complementary angles
two angles whose measures have a sum of 90 degrees
supplementary angles
two angles whose measures have a sum of 180 degrees
congruent
Sides are congruent, angles are congruent
vertical angles
a pair of opposite congruent angles formed by intersecting lines
adjacent angles
two angles that share a common vertex and side, but have no common interior points
alternate interior pair
angles which are on opposite sides of the transversal and inside of the parallel lines
corresponding angles
are angles which are in a similar position in relation to the transversal and the line that it intersects
parallel lines
lines that never intersect
perpendicular lines
Two lines that intersect to form right angles
equilateral triangle
a triangle with three congruent sides
isosceles triangle
a triangle with two congruent sides
scalene triangle
a triangle with no congruent sides
acute triangle
A triangle with three acute angles
obtuse triangle
a triangle with one obtuse angle
right triangle
a triangle with 1 right angle
rhombus
a parallelogram with 4 congruent sides
quadrilateral
a four-sided polygon
parallelogram
A quadrilateral with two pairs of parallel sides
trapezoid
a quadrilateral with exactly one pair of parallel sides
square
a parallelogram with four congruent sides and four right angles
rectangle
A parallelogram with 4 right angles
polygons
a closed plane figure made up of line segments
pentagon
a five-sided polygon
hexagon
a six-sided polygon
heptagon
a seven-sided polygon
octagon
an eight-sided polygon
nonagon
a nine-sided polygon
decagon
a ten sided polygon
regular polygon
a polygon with congruent sides and angles