# algebra vocab

### 46 terms by beeches

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### acute angle

An angle that measures less than 90 degrees.

### acute triangle

A triangle with all angles measuring less than 90 degrees.

### angle

A figure formed by two rays sharing a common endpoint called the vertex.

### complementary angle

Two angles whose measures add to 90 degrees.

### congruent

Figures with the same size and shape.

### correspondence

The relationship between two or more objects that are matched.

### equilateral triangle

A triangle with three congruent sides.

### isoscleles triangle

A triangle with at least two congruent sides.

### line

A straight path that extends without end in opposite directions.

### line symmetry

One half of a figure is a mirror image of the other half.

### line of symmetry

The imaginary line drawn down the center of a figure with line symmetry.

### obtuse angle

An angle whose measure is greater than 90 degrees.

### obtuse triangle

A triangle containing one obtuse angle.

### parallel lines

Lines in a plane that never intersect.

### parallelogram

A quadrilateral with two pairs of parallel sides.

### perpendicular lines

Lines that intersect to form right angles.

### plane

A flat surface that extends forever.

### point

An exact location in space.

### polygon

A closed figure formed by three or more line segments that intersect only at their endpoints.

### ray

A part of a line that starts at one endpoint and extends forever in one direction.

### rectangle

A parallelogram with four right angles.

### reflection

A transformation of a figure that flips the figure across a line.

### regular polygon

A polygon with congruent sides and angles.

### regular tessellation

A regular polygon is repeated to fill a plane.

### rhombus

A parallelogram with all sides congruent.

### right angle

An angle that measures 90 degrees.

### right triangle

A triangle containing a right angle.

### rotation

A transformation in which a figure is turned around a point.

### rotational symmetry

A figure can be rotated less than 360 degrees around a central point and coincide with the original figure.

### scalene triangle

A triangle with no congruent sides.

### segment

A part of a line between two endpoints.

### square

A rectangle with four congruent sides.

### supplementary angles

Two angles whose measures have a sum of 180 degrees.

### tesselation

A repeating pattern of plane figures that completely cover a plane with no gaps or overlaps.

### transformation

A change in the size or position of a figure.

### translation

A movement of a figure along a straight line.

### transversal

A line that intersects two or more lines.

### trapezoid

A quadrilateral with exactly one pair of parallel sides.

### Triangle Sum Theorem

The theorem that states that the measures of the angles in a trianlge add up to 180 degrees.

### vertical angles

A pair of opposite congruent angles formed by intersecting lines.

### corresponding angles

Angles formed by a transversal cutting through 2 or more lines that are in the same relative position.

A four sided figure

### pentagon

A five sided figure

### hexagon

A six sided figure

### heptagon

A seven sided figure

### octagon

An eight sided figure

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