Answer:
Step-by-step explanation:
Remark
2 of the sides are equal. That means that the two angles opposite the equal sides are equal as well.
Every triangle has 180 degrees
Solution
The unmarked angle = 61 degrees
x + 61 + 61 = 180 The three angles add to 180
x + 122 = 180 Subtract 122 from both sides
x + 122-122 = 180 - 122 Combine
x = 58
