# Geometry Terms

### 27 terms by kegarza

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### line

is perfectly straight and extends forever in both directions

### plane

is a perfectly flat surface that extends forever in all directions

### segment

is the part of a line between two points

### ray

is part of a line that starts at one point and extends forever in one direction

### angle

is formed by two rays with a common end-point called the vertex.

### right angle

an angle that measures 90 degrees

### acute angle

an angle that measures more than zero but less than 90 degrees

### obtuse angle

an angle that measures more than 90 degrees, but less than 180 degrees

### complementary angles

two angles whose measures add to 90 degrees

### supplementary angles

two angles whose measures add up to 180 degrees

### congruent figures

figures that have the same shape and same size

### vertical angles

a pair of opposite congruent angles formed by intersecting lines

### Triangle Sum Theorem

states that the measures of the angles in a triangle add up to 180 degrees

### acute triangle

has 3 acute angles

### right triangle

has one right angle

### obtuse triangle

has one obtuse angle

### equilateral triangle

has three congruent sides and angles

### isosceles triangle

has at least two congruent sides and angles

### scalene triangle

has NO congruent sides or angles

### polygon

is a closed plane figure formed by three or more sides

### regular polygon

a polygon with congruent sides and angles

### trapezoid

a quadrilateral with exactly one pair of parallel sides

### paralellogram

a quadrilateral that has 2 pairs of parallel sides

### rectangle

a parallelogram with four right angles

### rhombus

a parallelogram with all side congruent

### square

a parallelogram with four right angles and four congruent sides

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