It is usually "square peg in a round hole".
A a sweet round pastry with a hole in it is a doughnut.
If there is dirt in a hole of the specified dimensions, you weren't very successful at digging the hole.
The 19th hole can be the first playoff hole after a round of golf, but it is another name for the bar after the round.
1 and 5.
A port hole ?
The phrase "Square peg in a round hole" is often misquoted as "a round peg in a square hole". This phrase means that a person feels out of place with their surroundings or those within it. The origin of "a square peg in a round hole" is a proverb that dates back to the 1600s' in England.
About 8.5 (Pi*(6/12)^2*290)/27