Save
or

or

taken

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.

focusNode
Didn't know it?
click below

Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
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

# geometry of 2D

### Geometry of 2D shapes

TermDefinition
Area The number of square units needed to cover a given surface
Trapezoid A quadrilateral with exactly one pair of parallel sides
Perimeter The distance around a polygon
Circumference The distance around a circle
Surface Area The sum of the areas of the faces or surfaces of a three-dimensional figure
Prism A polyhedron that has two congruent polygon shaped bases and other faces that are parallelograms
Volume The number of cubic units needed to fill a given space
Parallelogram A quadrilateral with two pairs of parallel sides
Diameter A line segment that passes through the center of a circle and has end-points on the circle or the length of that segment
Radius A line segment with one end-point at the center of a circle and the other end-point on the circle or that length of the segment
area of a rectangle length x width
area of a parallelogram base x height
area of a trapezium ((a +b) x h)/2
Area of a triangle A = (b x h) divided by 2
Circumference of circle Pi x d
Perimeter of a rectangle (and parallelograms) A = 2(L x W)
Triangle Area = 1/2 x base x perpendicular height
Square Area = base x base
Rectangle Area = base x height
Parallelogram Area = base x perpendicular height
Trapezium Area = 1/2 x height x (top + bottom)
Circle Area = π x r squared
Area (rhombus) bxh
Acute Triangle A triangle with 3 acute angles
Right Triangle A triangle that has a 90 degree angle (right angle)
Obtuse Triangle A triangle with one angle that is greater than 90 degrees.
Square Four equal sides and four right angles
Rhombus A parallelogram with four equal sides
Trapezoid(US)/Trapezium(UK) A quadrilateral with exactly one pair of parallel sides
Pentagon 5 sided polygon
Octagon 8-sided polygon
Nonagon 9 sided polygon
Decagon 10 sided polygon
Heptagon 7 sided polygon
Hexagon 6 sided polygon

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
 "Know" box contains: Time elapsed: Retries:
restart all cards