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` = "Interface Angle from Rise over Run"`

Enter a value for all fields

The **Interface Angle from Rise over Run** calculator computes the outer angle made by two intersecting right triangles defined by their pitch defined as rise over run.

**INSTRUCTIONS**: Enter the following:

- (
**RS1**) Rise in Pitch 1 - (
**RN1**) Run in Pitch 1 - (
**RS2**) Rise in Pitch 2 - (
**RN2**) Run in Pitch 2

**Interface Angle (B): **The calculator returns the angle in degrees. However, this can be automatically converted to compatible units via the pull-down menu.

The formula for the exterior angle of intersection of two right triangles is:

B = π + P1 - P2

where:

- B = Interface Angle
- P1 = Angle 1
- P2 = Angle 2

Note: P1 and P2 are two pitches. They are converted to radian angles.

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