# PA Chapter 7 Vocabulary Flashcards

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1

Acute Angle

An angle with a measure greater than 00 and less than 900.

2

Right Angle

An angle with a measure of 900.

3

Obtuse Angle

An angle with a measure greater than 900 but less than 1800.

4

Straight Angle

An angle with measure of 1800.

5

Vertical Angle

Two pairs of opposite angles formed by two intersecting lines.

6

Two angles that have the same vertex, share a common side, and do not overlap.

7

Complementary Angle

Two angles that have a sum of their measures as 900.

8

Supplementary Angle

Two angles that have a sum of their measures as 1800.

9

Parallel Lines

Two lines in the same plane that do not intersect.

10

Transversal

A line that intersects two parallel sides.

11

Corresponding Angles

Angles that have the same position on two different parallel lines cut by a transversal.

12

Alternate Interior Angles

Nonadjacent interior angles found on opposite sides of the transversal.

13

Alternate Exterior Angles

Nonadjacent exterior angles found on opposite sides f the transversal.

14

Consecutive Interior Angles

When two lines are cut by a transversal, the pair of angles on one side of the transversal and inside the two lines.

15

Triangle

A figure having three sides

16

Equilateral Triangle

A triangle with all sides congruent.

17

Isosceles Triangle

A triangle with two sides congruent.

18

Scalene Triangle

A triangle with no sides congruent.

19

Right Triangle

A triangle with one right angle.

20

Legs

The sides that are adjacent to the right angle of a right triangle.

21

Hypotenuse

The side opposite the right angle in a right triangle.

22

Pythagorean Theorem

If a triangle is a right triangle, then the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs.

23

A closed figure with four sides and four vertices.

24

Parallelogram

A quadrilateral with opposite sides parallel and congruent.

25

Rhombus

A parallelogram with four congruent sides.

26

Rectangle

A parallelogram with four right angles.

27

Square

A parallelogram with all sides congruent and four right angles.

28

Trapezoid

A quadrilateral with exactly one pair of parallel sides.

29

Isosceles Trapezoid

A figure in which non-parallel sides and base angles are of the same measure.

30

Polygon

A simple closed figure in a plane formed by three or more line segments.

31

Sum Interior Angles of Polygon

(n - 2) * 180

32

Transformation

A movement of a geometric figure.

33

Reflection

A transformation where a figure is flipped over a line.

34

Line of Reflection

An image will reflect through a line.

35

Translation

A transformation where a figure is slide from one position to another without being turned.

36

Rotation

A transformation where a figure is turned around a fixed point.

37

Dilation

A transformation that alters the size of a figure but not its shape.

38

Scale Factor

The ratio of a length on a scale drawing or model to the corresponding length on the real object.

39

Similar Figures

Figures that have the same shape but not necessarily the same size.