2000003207

SubArea: 
Triangles
Level: 
A
Project ID: 
2000003207
Accepted: 
0
Clonable: 
0
Easy: 
1
Two isosceles obtuse-angled triangles are symmetrical about the axis o. See the picture. What is the measure of the angle δ?
280∘
160∘
320∘
340∘