Question

1. (4x + 8)°

Explanation:

Step1: Identify Triangle Type

The triangle has three equal sides (marked with ticks), so it's equilateral. In an equilateral triangle, all angles are \(60^\circ\).

Step2: Set Up Equation

Set \(4x + 8 = 60\) (since equilateral triangle angles are \(60^\circ\)).

Step3: Solve for \(x\)

Subtract 8 from both sides: \(4x = 60 - 8 = 52\).
Divide by 4: \(x = \frac{52}{4} = 13\).

Answer:

\(x = 13\)