SOLUTION: the two perpendicular sides of a triangle are 4 and 8. what is the length of the third side

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Question 546524: the two perpendicular sides of a triangle are 4 and 8. what is the length of the third side
Answer by nerdybill(7384) About Me  (Show Source):
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the two perpendicular sides of a triangle are 4 and 8. what is the length of the third side
Since "two sides are perpendicular", it must be a "right triangle" -- you can now apply Pythagorean theorem:
Let x = third side
then
4%5E2+%2B+8%5E2+=+x%5E2
16+%2B+64+=+x%5E2
80+=+x%5E2
sqrt%2880%29+=+x
sqrt%282%2A2%2A2%2A2%2A5%29+=+x
2%2Asqrt%282%2A2%2A5%29+=+x
2%2A2%2Asqrt%285%29+=+x
4%2Asqrt%285%29+=+x (exact answer)
OR
8.944+=+x (approximate answer)