Busy. Please wait.

Forgot Password?

Don't have an account?  Sign up 

show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the email address associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know (0)
Know (0)
remaining cards (0)
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Daniel GeometryTerms

acute triangle A triangle in which all three angles are acute
angle A figure formed by two rays that have a common endpoint
chord A line segment with its endpoints on a circle
circle A closed plane figure with all points on the figure the same distance from the center
circumference The distance around a circle
closed figure A figure that begins and ends at the same point
cone A solid figure that has a circular base and one vertex
congruent Having the same size and shape
congruent figures Figures that have the same size and shape
coordinate plane A plane formed by two intersecting and perpendicular number lines called axes
coordinates The numbers in an ordered pair
cube A solid figure with six congruent square faces
cylinder A solid figure that has two parallel bases that are congruent circles
degree (°) A unit for measuring angles and temperature
diameter A line segment that passes through the center of a circle and has its endpoints on the circle
dimension A measure in one direction; the length, width, or height of a figure
edge The line segment where two faces of a solid figure meet
equilateral triangle A triangle with three congruent sides
face A polygon that is a flat surface of a solid figure
figurate numbers Numbers that can be represented by geometric figures
hexagon A polygon with six sides and six angles
hypotenuse In a right triangle, the side opposite the right angle; the longest side in a right triangle
intersecting lines Lines that cross at exactly one point
isosceles triangle A triangle with two congruent sides
line A straight path in a plane that goes on forever in opposite directions
line segment A part of a line that includes two points, called endpoints, and all of the points between them
line symmetry A figure has line symmetry if a line can separate the figure into two congruent parts
obtuse angle An angle whose measure is greater than 90° and less than 180°
obtuse triangle A triangle that has one obtuse angle
octagon A polygon with eight sides
ordered pair A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move horizontally and the second number tells how far to move vertically
parallel lines Lines in a plane that never intersect
parallelogram A quadrilateral whose opposite sides are parallel and congruent
pentagon A polygon with five sides
perpendicular lines Two lines that intersect to form four right angles
plane A flat surface that extends without end in all directions
plane figure A figure which lies in a plane
point An exact location in space, usually represented by a dot
point symmetry When a figure can be turned half way about a central point and still look the same
polygon A closed plane figure formed by three or more line segments
polyhedron A solid figure with flat faces that are polygons
prism A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles
protractor A tool used for measuring or drawing angles
pyramid A solid figure with a polygon base and all other faces triangles that meet at a common vertex
quadrilateral A polygon with four sides
radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle
ray A part of a line, with one endpoint, that continues without end in one direction
rectangle A parallelogram with four right angles
rectangular prism A solid figure in which all six faces are rectangles
reflection (flip) A movement of a figure to a new position by flipping it over a line
regular polygon A polygon in which all sides are congruent and all angles are congruent
rhombus A parallelogram with four congruent sides
right angle An angle formed by perpendicular lines, line segments, or rays and with a measure of 90°
right triangle A triangle with one right angle
rotation (turn) A movement of a figure by turning it around a fixed point
rotational symmetry The property of a figure that can be rotated less than 360° around a central point and still be congruent to the original figure
scale drawing A drawing that shows a real object smaller than (a reduction) or larger than (an enlargement) the real object
scalene triangle A triangle with no congruent sides
similar figures Figures with the same shape but not necessarily the same size
solid figure A three-dimensional figure
pi The ratio of the circumference of a circle to its diameter
sphere A solid figure that has the shape of a round ball; all points are the same distance from the center
square A rectangle with 4 equal sides
square pyramid A pyramid with a square base and four triangular faces
tangram A puzzle consisting of seven polygon-shaped pieces that can be rearranged to make various figures or shapes
tessellation An arrangement of closed figures that completely covers a surface with no gaps and no overlaps
three-dimensional Measured in three directions, such as length, width, and height
transformation The movement of a figure by a translation, reflection, or rotation
Created by: danielneal