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Answer:
by using Pythagoras law
16²=(2x²)²+(2x²)²(since base angle of isosceles triangle is equal
16²=4x⁴+4x⁴
16²=16x⁴
16=x⁴
x=2
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![x = \sqrt[4]{16}](https://img.qammunity.org/2022/formulas/mathematics/high-school/81o2saeuv7ee0hgholp3o94u0c80xmab14.png)