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# Math::HALF_PI
```cpp
constexpr float HALF_PI = 1.57079632679489661923f;
```
`HALF_PI` 是圆周率除以 2即 90 度对应的弧度值,约为 1.57079632679489661923。该常量常用于角度与弧度的转换、四分之一圆周计算等场景。
**示例:**
```cpp
#include <XCEngine/Math/Math.h>
float ninetyDegreesRadians = HALF_PI;
```
## 相关文档
- [Math 总览](h.md) - 返回 Math 概览