Question

what is the value of u?
c
u
b
39°
a
u =
submit

Explanation:

Step1: Identify the triangle type

Since two sides of the triangle \( \triangle ABC\) are equal (marked with the same tick), it is an isosceles triangle. In an isosceles triangle, the base - angles are equal.

Step2: Use the angle - sum property of a triangle

The sum of angles in a triangle is \(180^{\circ}\). Let \(u\) be the unknown angle. We know one of the base - angles is \(39^{\circ}\), and the other base - angle (opposite the equal side) is also \(39^{\circ}\). So, \(u + 39^{\circ}+39^{\circ}=180^{\circ}\).

Step3: Solve for \(u\)

$$
LATEXBLOCK0
$$

Answer:

\(102\)