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Correct case for 'pi' in area calculation challenge #54471

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Correct case for 'pi' in area calculation challenge
mwiemer-microsoft Jun 17, 2026
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BillWagner Jun 18, 2026
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2 changes: 1 addition & 1 deletion docs/csharp/tour-of-csharp/tutorials/numbers-in-csharp.md
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Expand Up @@ -251,7 +251,7 @@ You saw the basic numeric types in C#: integers and doubles. There's one other t

***Challenge***

Now that you know the different numeric types, write code that calculates the area of a circle whose radius is 2.50 centimeters. Remember that the area of a circle is the radius squared multiplied by PI. One hint: the runtime contains a constant for PI, <xref:System.Math.PI?displayProperty=nameWithType> that you can use for that value. <xref:System.Math.PI?displayProperty=nameWithType>, like all constants declared in the `System.Math` namespace, is a `double` value. For that reason, you should use `double` instead of `decimal` values for this challenge.
Now that you know the different numeric types, write code that calculates the area of a circle whose radius is 2.50 centimeters. Remember that the area of a circle is the radius squared multiplied by pi. One hint: the runtime contains a constant for pi: <xref:System.Math.PI?displayProperty=nameWithType>. Because `Math.PI` is a `double` value, you should use `double` instead of `decimal` values for this challenge.

You should get an answer between 19 and 20.

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