Use the theorem of Pythagoras to calculate
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- Input the two lengths that you have into the formula. ...
- After the values are put into the formula we have 4²+ 8² = c²
- Square each term to get 16 + 64 = c²
- Combine like terms to get 80 = c²
- Take the square root of both sides of the equation to get c = 8.94 .
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