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You must have at least two of the side lengths. You calculate using the Pythagorean Theorem (a^2+ b^2= c^2 (assuming a and b are the legs and c is the hypotenuse (longest side))). Ex. a=3 b=4 c=? 3^2= 9. 4^2=16. 9+16= 25. The square root of 25= 5; The hypotenuse

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12y ago
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11y ago

determine the length of the unknown side of 12m and 13m of a right triangle

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Jeff Fam

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3y ago

23 cm 16 cm and 8 cm

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Q: How do you find the length of the side of a right triangle?
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How do you find the side length of a right triangle if you have one side length?

One side is not enough. For a right triangle the third side can be calculated by Pythagoras' Theorem if you know the length of any two sides.


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Pythagorean Theorem: a2 + b2= c2 where c is the hypotenuse of a right triangle. Hypotenuse is the side of a right triangle opposite to the right angle.


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Use either the Sine or Cosine rules depending on the information you know about the triangle.


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