Question

1. 2x x² x 6. 18 20 x

Explanation:

Step1: Use the property of isosceles triangle

Since the triangle is isosceles (marked with two equal - side marks), the two equal sides are \(x\) and \(20\).

Step2: Determine the value of \(x\)

By the definition of an isosceles triangle (two sides are equal), we have \(x = 20\).

Answer:

\(x = 20\)