$$\angle8\ \ and\ \angle7$$

$$\angle8\ and\ \angle6$$

$$\angle8\ and\ \angle5$$

20^o

70^o

160^o

180^o

arc CE 

arc BC

arc CBE

arc CBD

arc CD

arc BC

arc CBE

arc CBD

arc CD

arc BC

arc CBE

arc CBD

central

inscribed

central

inscribed

$$\angle BEC$$  

$$\angle DCE$$  

$$\angle EAD$$  

$$\angle ACD$$  

$$\angle BEC$$  

$$\angle EAD$$  

$$\angle CAD$$  

$$\angle CDA$$  

arc EL

arc EI

arc IP

arc LP

arc EL

arc EI

arc IP

arc LP

$$\angle ELI$$  

$$\angle LIP$$  

$$\angle SIP$$  

$$\angle LSP$$  

$$\angle ELI$$  

$$\angle LIP$$  

$$\angle SIP$$  

$$\angle LSP$$  

45^o

90^o

22.5^o

128^o

93

130

120

95

A

B

C

D

A

B

C

D