SOLUTION: how do i find the length of the diagonal of a computer screen that measures 28cm by 21 cm

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Question 344802: how do i find the length of the diagonal of a computer screen that measures 28cm by 21 cm
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
The diagonal forms a Right Triangle with sides 21cm and 28cm
Use the Pythagorean Theorem to solve for the length of the diagonal (hypotenuse)
a%5E2+%2B+b%5E2+=+c+%5E2 where a and be are the sides and c the hypotenuse.
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21%5E2+%2B+28%5E2+=+c+%5E2
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441+%2B+784+=+c+%5E2
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1225+=+c+%5E2
c=sqrt%281225%29
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c+=+highlight%2835cm%29