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Sagot :
Answer:
number one is 90°
Step-by-step explanation:
number 9 is an acute angle
Answer:
1. Perpendicular
2. Complementary
3. A vertex
4. Midpoint
5. Vertical
6. Angle bisector
7. Supplementary
8. Coplanar
9. An acute angle
10. Congruent
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