Question

find m∠str.
answer attempt 1 out of 2
m∠str =
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Explanation:

Step1: Identify isosceles triangle sides

In $\triangle RST$, $\overline{RS} = \overline{ST}$, so $\angle TRS = \angle STR$.

Step2: Use triangle angle sum

The sum of angles in a triangle is $180^\circ$. Let $m\angle STR = x$.
$$122^\circ + x + x = 180^\circ$$

Step3: Solve for x

Simplify and isolate $x$:
$$2x = 180^\circ - 122^\circ$$
$$2x = 58^\circ$$
$$x = \frac{58^\circ}{2} = 29^\circ$$

Answer:

$29$