# Geometry 5th Vocabulary

### 37 terms by bertelsen

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### Square

4 equal sides. 90 degree angles.

### Rectangle

quadrilateral. 90 degree angles.

4-sided polygon

### Perimeter

distance around a figure

### Area

number of square units it takes to cover a figure

90 degree angle

3-sided polygon

### Acute Triangle

3-sided polygon, each angle is less than 90 degrees

### Obtuse triangle

3-sided polygon, 1 angle greater than 90 degrees

### Right Triangle

3-sided polygon. One 90 degree angle.

### Isosceles Triangle

3-sided polygon. 2 congruent sides.

### Equilateral Triangle

3-sided polygon. 3 congruent sides. 3 60 degree angles.

### Scalene Triangle

3-sided polygon. No congruent sides

### parallelogram

4-sided quadrilateral. 2 pairs of parallel lines

### parallel lines

lines that will never intersect

### trapezoid

4-sided quadrilateral. 1 pair of parallel lines

### congruent

same size, same shape

### rhombus

4-sided polygon with all congruent sides

### segment

section of a line between two endpoints

### vertex or vericies

the point where 2 lines meet

### polygon

many-sided figure, closed, straight line segment

### regular polygon

polygon with congruent sides and congruent angles

### irregular polygon

polygon without all congruent sides

### straight angle

angle measuring 180 degrees

### complementary angles

angles whose sum equals 90 degrees

### Supplementary angles

angles whose sum equals 180 degrees

### regular polygon

a polygon with congruent sides and congruent angles

5-sided polygon

6-sided polygon

7-sided polygon

8-sided polygon

9-sided polygon

### acute angle

an angle less than 90 degrees

### obtuse angle

an angle more than 90 degrees

lines that cross

### perpendicular lines

lines that intersect and form 90 degree angles where they cross

### angle

two rays that start from the same endpoint

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