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# Finding a Missing side in a 45°, 45°, 90° special Triangle

Finding a Missing side in a 45°, 45°, 90° special Triangle

Topic 19: Finding a Missing side in a 45°, 45°, 90° special Triangle

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Dependent on which side is missing will determine your equation.  The  ratio you want to remember is x, x, x√2 which √2=1.4, so if you are  missing a leg side in an isosceles triangle the base angles are the same  so both leg sides will be the same.  Using the value of a side you can  figure the hypotenuse side by X√2.  If only given the Hypotenuse side,  we must divide by √2 so X√2/√2 which will equal X your leg sides and  they will be the same.  Given the hypotenuse side we must divide by the  √2 and then we rationalize multiplying that √2/√2 and simplifying from  there.  Topic 19 Examples.pdf Download Topic 19 Examples.pdf

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