# Quarter Circle Calculator

Calculation of the quarter circle. A quarter of a circle inscribed in a square. The missing part of the square outside the quarter circle is also called a spandrel. Enter one known value. Then click the “Calculate” button.

**Quarter Circle Calculator**

**Radius (r)**

**Arc length (l)**

**Perimeter (P)**

**The area of the quarter circle (A1)**

**The area of the missing piece (A2)**

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