UnScramble this Word: r l v c e y l e?

Questions

What is the total of the three internal angles of a triangle?

Which disciple denied knowing Jesus Christ three times?

Which Philadelphia vocal group were favorites of Prince Charles?

Which cartoon character had 3 nephews called Huey,Dewey and Louie?

Where did Dawn singer Tony Orlando tell his loved one to knock three times in the song of the same name?