Question

what is the value of u?

Explanation:

Step1: Recall exterior - angle property

The exterior - angle of a triangle is equal to the sum of the two non - adjacent interior angles.
So, \(u + 43^{\circ}=u + u\).

Step2: Solve the equation

\[

$$\begin{align*} u + 43^{\circ}&=2u\\ 2u - u&=43^{\circ}\\ u&=43^{\circ} \end{align*}$$

\]

Answer:

\(43^{\circ}\)