Answer:
15 degrees
Step-by-step explanation:
angle a= (180-90)/2=90/2=45 degrees
angle QRP = 60
Angle b = 60-45=15 degrees
Answer:
I believe the value would be 9.
Answer:
Step-by-step explanation:
85
Answer:
It should have 20 vertices, and the name is dodecahedron