Final answer:
An indirect proof begins by assuming the opposite of what you intend to prove is true.
Step-by-step explanation:
The correct answer is true.
In an indirect proof, you assume the opposite of what you intend to prove is true. This is done to show that the opposite assumption leads to a contradiction or an impossibility.
For example, if you want to prove that a triangle is isosceles (having two sides of equal length), you can assume that it is not isosceles. By working through the steps and logical deductions of the proof, if you arrive at a contradiction, then the opposite assumption (that the triangle is not isosceles) must be false, and the original statement (that the triangle is isosceles) is true.