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2 dimensional figures

Terms in this set (20)

square
quadrilateral with 4 equal sides, 4 right angles; Exactly 2 pairs of parallel sides. opposite sides and angles are congruent.
regular polygon
(a.k.a. rhombus, rectangle, parallelogram)
rhombus
quadrilateral with 4 equal sides;
Exactly 2 pairs of parallel sides. opposite sides and angles are congruent. regular polygon.
parallelogram
quadrilateral with 2 pairs of parallel sides. Opposite sides and angles are congruent.
trapezoid
quadrilateral with 1 pair of parallel sides
rectangle
quadrilateral with opposite equal sides, 4 right angles. Exactly 2 pairs of parallel sides.
polygon
a closed plane figure formed by three or more line segments that meet at points called vertices. It is named by the number of sides and angles it has.
hexagon
has six sides, six angles and six vertices (points)
regular polygon
all sides are congruent, all angles are congruent
Parallel lines
lines that never intersect
Perpendicular lines
Lines that intersect to form right angles
Intersecting lines
lines that intersect or cross at one point.
right angle
an angle that measures 90 degrees
acute angle
an angle that measures less than 90 degrees
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
Equilateral triangle
A triangle with three congruent sides and 3 congruent angles. all angles are acute.
Isosceles triangle
A triangle with 2 congruent sides and 2 congruent angles. Angles can be acute, obtuse and right.
Scalene Triangle
A triangle with no congruent sides. Angles can be acute, obtuse, and right.
Acute Triangle
A triangle with 3 acute angles.
Right Triangle
A triangle with 1 right angle and 2 acute angles.
obtuse Triangle
A triangle with one obtuse angle and 2 acute angles.
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