Please choose the correct solution to the question: what is a right angle

Solution1: In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.

Solution2: In geometry and trigonometry, a right angle is an angle of exactly 190° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.

Answer format: solution1/solution2
Answer: solution1