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

perimeters 2d shapes

perimeters and areas of 2D shapes

Rectangle Area = lw Perimeter = 2l + 2w
Square Area = 4s Perimeter = s^2
Parallelogram Area = bh Perimeter = 2(b + a)
Rhombus Area = bh Perimeter = 4b
Triangle Area = (1/2)bh Perimeter = a + b + c
Kite Area = (1/2)d1d2 Perimeter = a + b + c + d
Trapezoid Area = (1/2)h(b1 + b2) Perimeter = 2a + b1 + b2
Circumference of circle c=π•d
Area of square a=s^2
Area of rectangle A=l•w
Area of triangle A=l•w/2
Area of parallelogram/rhombus A=b•h
Area of trapezoid A=(b1+b2)/h
Area of circle A=πr^2
Perimeter of square P=s•4
Perimeter of rectangle P=l+w+l+w
Perimeter of quadrilateral s+s+s+s
Segment Area of sector-area of triangle
Regular Polygon ½Pa
Sector x/360×πr²
Perimeter Distance around a shape.
Area Number of square units used to fill up a shape.