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Square the hypotenuse's length, halve this number and then square root the remaining number. This is the length of the other two sides.


Since this is a right angled isosceles triangle, the two other sides must be equal in length.

Pythagoras theorem a2+b2=c2 (c is the hypotenuse).

To get c2 we must square the hypotenuse.

Since the two other sides are equal in length, a and b must be the same.

Therefore a2 and b2 are both halves of c2. Halving c2 will give you both a2 and b2.

Now, we just sqaure root a2 or b2 to get the length of these sides.

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โˆ™ 2012-07-26 09:02:01
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Q: How do you find the other sides of a right angled isosceles triangle when you know the hypotenuse?
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What is hypotenuse of a isosceles triangle?

The hypotenuse is the longest line in a right angle triangle, or the line opposite the 90 degree angle. So a hypotenuse only exists for right angled isosceles triangles. The hypotenuse is calculated by taking the square root of the sum of the squares of the other two sides. So for example, if the one of the other sides is 1 then the hypotenuse is 2; Becuase 1 squared is 2, and as this is a right angled isosceles the other non-hypotenuse side will be the same length, so 2+2=4, then you take the square root of the sum and you get 2.

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