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There are several right angles on the corner of 3.
What you want to ask is how many right angles there are in a triangle. 1.

A triangle has at most 1 right angles, the right angle is 90 degrees, and the internal angles of the triangle add up to 180 degrees, so the triangle has at most 1 right angles.

When adjacent angles formed by a straight line and another horizontal straight line are equal, each of these angles is called a right angle.