1. The measures of two angles add to 90° if and only if the angles are complementary.
- Inverse
- Converse
- Bioconditional
- Contrapositive

2. If the measures of two angles do not add to 90°, then the angles are not complementary.
- Inverse
- Converse
- Bioconditional
- Contrapositive

3. If two angles are complementary, then the measures of their angles add to 90°.
- Inverse
- Converse
- Bioconditional
- Contrapositive

4. If two angles are not complementary, then the measures of their angles do not add to 90°.
- Inverse
- Converse
- Bioconditional
- Contrapositive