### 32 terms by fallywally

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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

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

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

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