One of the sharp corners of a right triangle is 70 degrees. Find another sharp corner.

This task is not difficult, it can be solved in two steps. To answer the question of the problem of finding the third angle of a triangle, you need to know the sum of the other two angles. From the condition of the problem, it is known what the acute angle of the triangle is, and it is also known that the triangle is rectangular, that is, one of its angles is straight and is equal to 90 degrees.
1. Find out what the sum of the two angles of the triangle is equal to.
70 + 90 = 160 degrees.
2. Find another sharp corner.
180-160 = 20 degrees.
Answer: Another acute angle is 20 degrees.

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