### 25 terms by sophiesboys

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### point

indicates location in space and has no size.

### line

a series of infinite points that extends forever in opposite directions.

### plane

a flat surface that extends infinately in all directions

### parallel lines

two lines in the same plane that never intersect

### angle

formed by two rays with a common endpoint called the vertex

### right angle

an angle whose measure is exactly 90 degrees

### straight angle

an angle whose measure is exactly 180 degrees, an angle that forms a straight line

### vertex

where two rays have a common end point

### ray

a part of a line with one endpoint and all the points of the line on one side of the endpoint

### line segment

a finite portion of a line.

### intersecting lines

two lines in the same plane that share a single point

### skew lines

lines that do not exist in the same plane. They are neither intersecting or parallel

### acute angle

an angle whose measure is less than 90 degrees

### obtuse angle

an angle whose measure is greater than 90 degrees and less than 180 degrees

### complementary angles

two angles whose combined measures add up to 90 degrees

two angles that share a common ray (vertex and side) but have no interior points in common

### vertical angles

two angles that are opposite each other when two lines intersect. also known as opposite angles

### acute triangle

a triangle with 3 acute angles

### obtuse triangle

a triangle with one obtuse angle

### isosceles triangle

a triangle with at least 2 congruent sides

### supplementary angles

two angles whose combined measures add to 180 degrees

identical, equal

### right triangle

a triangle with one right angle

### scalene triangle

a triangle with sides of different lengths

### equilateral triangle

a triangle with 3 congruent sides

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