Question 68998: i have a verrrry simple question but i just cant think of the answer...
how do you find the length of a parallelograms diagonal??
i need it quick,,,
Answer by Edwin McCravy(20060)   (Show Source):
You can put this solution on YOUR website! i have a verrrry simple question but i
just cant think of the answer...
how do you find the length of a
parallelograms diagonal??
i need it quick,,,
Diagonal of a parallelogram = the square root of the
sum of the squares of two adjacent sides reduced by
twice their product times the cosine of the angle
opposite the diagonal desired.
In other words
D______________C
/ . ./
/ . /
/·____________/
A B
There are two diagonals, AC and BD
_________________________
diagonal AC = ÖAB² + BC² - 2×AB×BC×cosÐB
_________________________
diagonal BD = ÖAB² + BC² - 2×AB×BC×cosÐA
Edwin
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