Question

The circled ones are incorrect. What are the reasons for steps 2 and 4?

Answer 1

`\text{2. Correct reason: Sum of angles of triangle is 180}^o.\\\text{4. Correct reason: From statement 3, subtracting 90 from both sides.}`

`\text{Three angles cannot be supplementary. Supplementary angles are two angles}\\\text{whose sum is }180^0.`