An angle that measures less than 90 degrees.
A triangle in which all three angle are less than 90 degrees.
Two rays that share a common endpoint.
adjacent angles that equal 180 degrees
Adjacent angles that equal 90 degrees.
The number of square units inside a closed figure.
A closed round shape with a measure of 360 degrees.
Lines that cross each other at a point.
A straight path that goes on forever in both directions.
An angle that is bigger than a right angle.
A triangle with one obtuse angle.
Lines that will never cross, even if they are extended forever.
The distance around the outside edge of a closed figure.
Lines that form right angles where they cross.
A closed figure made up of line segments.
A polygon with 4 sides and 4 angles.
A polygon with 5 sides and 5 angles.
A polygon with 6 sides and 6 angles.
A polygon with 8 sides and 8 angles.
A quadrilateral with 4 right angles.
A quadrilateral with 4 right angles and 4 equal sides.
A quadrilateral with one pair of parallel sides.
A quadrilateral with two pairs of opposite parallel sides.
A quadrilateral with two pairs of parallel sides, and all 4 sides of equal length.
A straight path with one endpoint, that goes on forever in the other direction.
An angle with a measurement of exactly 90 degrees.
A straight path between two endpoints.
line of symmetry
A line that cuts a figure into two parts that are the mirror image of each other.
An angle that measures exactly 180 degrees.
A triangle with 3 equal sides and 3 acute angles that are also equal.
A triangle with 2 equal sides.
A triangle with no equal sides.
A triangle with one right angle.
A polygon with 3 sides and 3 angles
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