Which of the following best describes an indirect proof? use definitions and postulates to deduce a conclusion. just accept a statement as true. assume a statement true and then show it must be false.

(c) Assume a statement is true and show that it must be false.

Step-by-step explanation: In mathematics, particularly in geometrical proofs, we apply different methods to prove a theorem or a result. For example-

(i) Sometimes, we use existing definitions and postulates to arrive at a conclusion. This is a type of direct method of proof, and so, option (a) is incorrect.

(ii) Accepting a statement to be true is not a part of the proof. So, option (b) will also not work.

(iii) First assuming a particular statement to be true and then showing it to be false (arriving at a contradiction) is a type of indirect proof. We call it the method of contradiction.

Thus, the correct option is (c).

the answer for this question is : 360°

step-by-step explanation:

we have been given a triangle   we need to tell which one of these is a triangle below to map onto itself.

360° rotation is the complete rotation which eventually leads to the same figure which is given.

the correct will be, that is 360° that will cause the triangle below to map onto itself.

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a