One corner of a triangle is 49 degrees. Find the rest.

The condition is not given to us completely, most likely the given triangle is rectangular and then the condition should sound as follows.
One corner of a right-angled triangle is 49 °. And we need to find the rest of the corners.
That is, we need to find the degree measure of the third angle.
For the solution, we apply the theorem on the sum of the angles of a triangle, which says that the sum of the angles of a triangle is 180 °.
It is also known that a triangle is rectangular, so one of the angles is 90 °.
To find the third corner:
180 ° – (90 ° + 49 °) = 180 ° – 139 ° = 41 °.