---
title: "-=(_:_:)"
framework: spatial
role: symbol
role_heading: Operator
path: "spatial/angle2d/-=(_:_:)"
---

# -=(_:_:)

Subtracts the second angle from the first and stores the difference in the left-hand-side variable.

## Declaration

```swift
static func -= (lhs: inout Angle2D, rhs: Angle2D)
```

## See Also

### Applying arithmetic operations

- [+(_:)](spatial/angle2d/+(_:).md)
- [+(_:_:)](spatial/angle2d/+(_:_:).md)
- [+=(_:_:)](spatial/angle2d/+=(_:_:).md)
- [-(_:)](spatial/angle2d/-(_:).md)
- [-(_:_:)](spatial/angle2d/-(_:_:).md)