Question

Which could be the first step of an indirect proof of the statement below? Select all that apply.

Answer 1

Step-by-step explanation:

dear b is the correct option because a triangle interior angles always have the sum is 180°

Answer 2

An indirect proof of the given statement will begin with the first statement - Assume that the sum of interior angles of a figure is 180° and the figure is not a triangle. (D)

• Indirect proof is also known as proof from contradiction.
• In this method, we start by taking a statement that is false with respect to the original statement and assuming that it is true. (basically taking the opposite of what the original statement states.)
• And then we continue on with the assumption till a contradiction arises.
• In this case, statement (D) is the false statement with respect to the original statement, so the indirect proof must start with it.