One of the corners of an isosceles triangle is 40. Find the other corners of the triangle.

Here’s 2 ways to solve:
Method 1:
1) 180 – 40 = 140 – 1 angle
2) 140/2 = 70 – angles at the base of an isosceles triangle (they are equal, so we divide by 2)
Method 2: (when corner 40 is at the base)
1) 40 + 40 = 80 – 2 and 3 corners (at the base)
2) 180 – 80 = 100 – 1 angle
Answer: 1) 40, 70, 70; 2) 100, 40, 40.