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Math 5.5
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5th Grade Math Unit 6 Vocabulary
Terms in this set (27)
isosceles triangle
A triangle that has at least two congruent sides.
kite
A 4-sided flat shape with straight sides that:
• has two pairs of sides.
• each pair is made of two adjacent sides (they
meet) that are equal in length.
• angles are equal where the pairs meet.
• one of the diagonal bisects (cuts equally in
half) the other.
obtuse angle
An angle with a measure greater than 90º but less than 180º.
parallel lines
Lines that are always the same distance apart. They do not intersect.
parallelogram
A quadrilateral with 2 pairs of parallel and congruent sides.
pentagon
A polygon that has five sides.
perpendicular lines
Two intersecting lines that form right angles.
plane figure
A two-dimensional figure.
polygon
A closed plane figure made by line segments.
quadrilateral
A four sided polygon.
rectangle
A angle
regular polygon
A closed figure formed from line segments that meet only at their endpoints. A polygon is regular when all angles are equal and all sides are equal.
right angle
An angle that measures exactly 90°.
right triangle
A triangle that has one 90° angle.
rhombus/rhombi
A quadrilateral with all 4 sides equal in length.
scalene triangle
A triangle that has no equal sides.
square
A parallelogram with 4 equal angles AND 4 equal sides.
triangle
A 3-sided polygon (a flat shape with straight sides).
trapezoid
A quadrilateral with one pair of parallel sides and one pair of sides that are not parallel.
two-dimensional
A plane flat figure that has length and width.
vertex
The point at which two line segments, lines, or rays meet to form an angle. (plural-vertices)
acute triangle
A triangle with no angle measuring 90° or more.
congruence/congruent
Having exactly the same size and shape.
equilateral triangle
A triangle whose sides are all the same length.
hexagon
A figure with six straight sides.
irregular polygon
A polygon that does not have all sides equal and all angles equal.
acute angle
An angle with a measure less than 90°.
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