Problem: What unusual shape might a rainbow adopt when seen from a plane flying above the clouds?
Answer: ring

Problem: According to the song, who left Kenny Rogers with four hungry children and crops in the field?
Answer: lucille

Problem: Which South American country has borders with Brazil, Bolivia and Argentina?
Answer: paraguay

Problem: In geometry, which unit is defined as being equal to the angle subtended at the centre of a circle by an arc equal in length to the radius ?
Answer:
radian