# 7th math geometry terms

## 33 terms

### Square

a parallelogram with four congruent sides and four right angles

### Rectangle

A quadrilateral in which the opposite sides are parallel and congruent; all angles are 90 degrees

4-sided polygon

### Perimeter

distance around a figure

90 degree angle

### 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. 2 congruent angles.

### Equilateral Triangle

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

### Scalene Triangle

3-sided polygon. No congruent sides or angles

### parallelogram

A quadrilateral with two pairs of parallel sides.

### trapezoid

a quadrilateral with exactly one pair of parallel sides

### congruent

same size, same shape

### rhombus

a parallelogram with all sides congruent.

### line segment

part of a line with two endpoints

### polygon

A closed plane figure made up of line segments

### regular polygon

polygon with congruent sides and congruent angles

### straight angle

angle measuring 180 degrees

distance from the center to the edge of the circle (half of the diameter)

### diameter

distance across a circle through the center point

### complementary angles

angles whose sum equals 90 degrees

### Supplementary angles

angles whose sum equals 180 degrees

5-sided polygon

6-sided polygon

7-sided polygon

8-sided polygon

9-sided polygon

### decagon

a ten-sided polygon

### dodecagon

a twelve-sided polygon

### point

an exact location in space

### ray

(mathematics) a straight line extending from a point

### line

a straight path that extends without end in opposite directions

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