# Geometric Properties

## 49 terms

### point

an exact location in space

### line

a straight path of points that extends without end in both directions

### line segment

a part of a line between 2 end points

### congruent line segments

line segments have the same length

### ray

a part of a line that begins at one point and extends without end in one direction

### plane

a 2 dimensional flat surface that extends without end in all directions

### intersecting lines

lines that meet at a point

### parallel lines

lines in a plane that never intersect

### perpendicular lines

lines that intersect and form a right angle

### skew lines

lines that are not in the same plan and to not intersect

### acute angle

measures less than 90 degrees

### right angle

measures 90 degrees

### obtuse angle

measures greater than 90 degrees but less than 180 degrees

### straight angle

measures 180 degrees

### reflex angle

measures greater than 180 degrees

### complementary angles

sum of the measurement of 2 angles is 90 degrees

### supplementary angles

sum of the measure of 2 angles is 180 degrees

### equilateral triangle

3 congruent angles

### isosceles triangle

at least 2 congruent sides

### scalene triangle

no congruent sides

### similar triangle

have angles of equal measures

### congruent triangles

have sides of equal length

3 acute angles

1 right angle

1 obtuse angle

### parallelogram

a quadrilateral having opposite sides parallel and congruent

4 sides

### rectangle

a parallelogram with opposite sides congruent and 4 right angles

### square

a rectangle having all sides congruent

### rhombus

a parallelogram with all sides congruent

### trapezoid

a quadrilateral having only one pair of parallel sides called bases

### polygon

a closed plane figure formed by line segments

5 sides

6 sides

7 sides

8 sides

9 sides

10 sides

11 sides

12 sides

a slide

a flip

a turn

### x axis

the horizontal axis

### y axis

the vertical axis

### diameter

the distance across a circle