# CH.10 vocab. test

## 30 terms

### square

a parallelogram having four right angles and four congruent sides

### vertex

a common endpoint of two rays forming an angle

### parallelogram

a quadrilateral with opposite sides congruent and opposite sides parallel

### straight

an angle that measures exactly 180 degrees

### right triangle

a triangle with one right angle

### reflection

a type of formation where a figure is flipped over a line of symmetry

### rectangle

a parallelogram with four right angles with opposite sides congruent and parallel

### triangle

a three-sided polygon

### scalene triangle

a triangle with no congruent sides

a four-sided polygon

### obtuse angle

an angle between 90 and 180 degrees

5-sided ploygon

### angle

two rays with a common endpoint

### isosceles triangle

a triangle with two equal sides

### octagon

an eight-sided polygon

### line of symmetry

a line that divides a figure into two halves that are reflections of each other

### nonagon

a nine-sided polygon

### obtuse triangle

a triangle with 1 obtuse angle

### tessallation

a pattern of shapes that completely cover a plane without overlaps or gaps

10 sided polygon

### acute triangle

a triangle with 3 acute angles

### regular polygon

a polygon with all sides and all angles equal

### polygon

A closed plane figure formed by three or more line segments that intersect only at their endpoints.

### trapezoid

A quadrilateral with one pair of parallel sides

### equilaterial triangle

all three sides are equal

### right angle

an angle that measures 90 degrees

### heptagon

a seven-sided polygon

### rhombus

a parallelogram with four equal sides

### hexagon

a six-sided polygon

### actue angle

an angle that measures greater than 0 and less than 90 degrees