Things You'll Need:
- Formula for finding the area of a trapezoid
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Step 1
With all geometric problems where you are being asked to find the dimensions of a shape, you will need to use a formula before you can get anywhere. The formula you will need to use to find the area of a trapezoid is A=(1/2)h(a+b). 'A' stands for area, 'h' stands for height, and 'a' and 'b' stand for the lengths of the bases (if the trapezoid is not already drawn out for you, you may need to do so in order to properly plug everything in).
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Step 2
You know the formula, now you need to plug in the givens of the problem (givens are the information the problem gives you about the trapezoid such as what the height and bases are equivalent to). Let's say, for instance, that the height of the trapezoid is 22, one base (label it 'a') is 11 and the other base (label it 'b') is 19.
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Step 3
Plug everything into the formula: A=(1/2)22(11+19). Work inside the parenthesis first; A=(1/2)22(30). Multiply 30 and 22; A=(1/2)660. What's one half of 660?: 330. So, therefore, the area for this trapezoid in particular is 330 (inches, or sq. ft depending on the problem). Piece of cake right? :)
Comments
drenee said
on 3/26/2009 saving to mu favs, on my way back to school, I'm sure I will need this sooner or later great explaination
athome said
on 3/25/2009 You lost me at trapezoid. :) Your to smart for me 5
SunnyStars said
on 3/25/2009 You make it sound so easy! =)
Sidhartha said
on 3/13/2009 I think this should be standard on every job interview hahaha.
jenng said
on 3/13/2009 this is so confusing lol 5*