Question

match these
converse
contrapositive
inverse

If two angles are supplementary, then they add to 180°.
If two angles are not supplementary, then they do not add to 180°.
If two angles do not add to 180°, then they are not supplementary.

Answer 1

For the converse, switch the "if" part with the "then" part.

Answer 2

For the inverse, negate both parts.

Answer 3

For the contrapositive, negate both parts and switch the "if" part with the "then" part.
Another way to say it is negate both parts of the converse.