Remember that the perimeter is the distance round the outside. The perimeter of a semicircle is half of the circumference plus the diameter.

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We have the 3-letter answer for Shape of a semicircle crossword clue, last seen in the Daily Themed Crossword January 6, 2025 puzzle. Sometimes we all need some help finding the answer!

Making a rough sketch of the whole shape is usually helpful. The width of the door is the same as the diameter of the semicircle, so we can use half of this distance as the radius.