I am stuck on this problem. I’m given 2 angles and I need to find the 3rd.

161 - 6x

Step-by-step explanation:

3 angles in a triangle all add up to 180 degrees so:

180 - (4x + 18 + 2x + 1)

180 - (4x + 2x + 18 + 1)

180 - (6x + 19)

180 - 6x - 19

180 - 19 - 6x

161 - 6x = your third angle

Let me know if you wanted to find x or if I've done anything wrong!

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc