Missing lengths of a 45°-45°-90° Special Right Triangle given Hypotenuse length = 8

Leg lengths of a 45°-45°-90° Special Right Triangle are equal
Leg lengths =
Hypotenuse length/√2

Leg lengths =
8/√2

Rationalize to remove the radical from the denominator:
Leg lengths =
8 * √2/√2 * √2

Leg lengths =
8√2/2

Leg lengths = 4√2 = 5.656854249492

The solution above and all other related solutions were provided by the 45°-45°-90° Special Right Triangle Application. 

Find Missing Lengths of a 45-45-90 Special Right Triangle

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