The inside angles of all triangles add up to 180 degrees. In a right triangle, one of the inside angles is 90 degrees, so the other two have to add up to 90.
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180 degrees
90 degrees
the same as a right triangle. It is just flipped. 90 degrees.
The 3 interior angles of a right angle triangle add up to 180 degrees
all triangles have 180 degrees