Question

I need help with these proofs. ​

Answer 1

9)

• 
  `BN`⊥
  `AD`---------Given

• ∠
  `1` and ∠
  `2` are right angles----------------definition of perpendicular lines

10)

• PT bisects AY-----------------------------Given
• AR≅RY---------------------------------------definition of segment bisector

11)

• OS bisects ∠CSW--------------------given
• ∠CSO≅∠WSO-------------------------definition of angle bisector

Explanation:

9) Given,
`BN`⊥
`AD`

⇒∠
`1` and ∠
`2` are right angles (definition of perpendicular lines)

10) Given,
`PT` bisects
`AY`

⇒
`AR`≅
`RY` (definition of segment bisector)

11) Given,
`OS` bisects ∠
`CSW`

⇒∠
`CSO`≅∠
`WSO` (definition of angle bisector)