DorelTibi
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DorelTibi
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DorelTibi
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help
DorelTibi
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help
aacehm
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|dw:1356989474509:dw| Does knowing that you can divide a parallellogram into a rectangle and two triangles help?
DorelTibi
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not really
aacehm
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|dw:1356989718574:dw|
|dw:1356989750298:dw|
DorelTibi
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I think its like this:
144+b^2=400
b^2=266
b=16.3
aacehm
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yep, that's the height of the rectangle, and you just need to find the length and multiply.
DorelTibi
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how do u find the length
DorelTibi
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?
DorelTibi
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help
aacehm
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well, think about it. If you cut that triangle off and put it back on, just on the other side, you're not changing the length at all
DorelTibi
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so its twelve inches the length
aacehm
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no, that's the length of the triangle you cut off. The length of the base of the parallelogram is the length.
DorelTibi
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so the length is 20
aacehm
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|dw:1356990749844:dw||dw:1356990808666:dw|
aacehm
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see how that works?
DorelTibi
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Im realy confused inorder to find the area i just have to multiply 20 and 16 and get 320
aacehm
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area of a parallelogram is base times height. You correctly found the height, using the pythagorean theorem. Now, you need to figure out which one the base is. (It's the one perpendicular to the height, and it's not 20). I was giving you a picture so you could see why this particular formula works.
DorelTibi
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is it 32
DorelTibi
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@aacehm im i right
aacehm
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yes, it's 32. I hope you understood how that worked.
DorelTibi
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so the area would be 16*32
DorelTibi
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yea?