• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/20

Click to flip

### 20 Cards in this Set

• Front
• Back
 Congruency Geometric figures having the same size and shape; all corresponding parts of congruent figures have the same measure. Perpendicular Lines in the same plane which intersect to form a right angle. Parallel Lines that lie in the same plane and never meet. Also, planes lying in space that never meet. Similarity Two or more figures having the same shape but not necessarily the same size. Symmetry A figure has symmetry if there exists some line or point through which all points of the figure can be reflected to generate another point on the figure. Three-dimensional An object that has length, width, and height. Two-dimensional A figure that has length and width but not height (i.e., a plane figure such as a rectangle or circle) Vertex (vertices) The points where two line segments come together (corners). vertical angles When two lines intersect, they make four angles at the vertex. The angles opposite each other are equal in size and are called vertically opposite angles. complementary angles Two angles for which the sum of their measures is 90°. straight angle An angle which measures 180°. supplementary angles Two angles for which the sum of their measures is 180°. straightedge An object that can be used to draw straight lines. adjacent angles Two angles positioned in the same plane that have a common side and a common vertex. acute angle A sharply pointed angle with size less than a right angle (<90°). protractor An instrument used to measure and draw angles. obtuse angle An angle that measures more than a right angle (greater than 90°) but smaller than a straight angle (180°). compass An instrument used to draw a circle and to mark off equal lengths. angle The space between two straight lines with a common endpoint or vertex. right angle An angle measuring exactly 90°.