For a right-angle layout, brace geometry or slope with a known horizontal and vertical relationship. The 90° corner is an assumption of this tool.
- Two known quantities
- Choose two different values: base, rise, hypotenuse, angle B or angle C. At least one must be a side.
- Angle reference
- B is the angle between base and hypotenuse; C is the other acute angle.
Supported combinations include two sides, or one side and an acute angle. Two angles alone cannot determine size. The hypotenuse must be longer than either leg.
- Base, rise, hypotenuse, both acute angles and rise/run slope percentage.
Base and rise are the two selected inputs.
| Quantity | Value |
|---|---|
| Base; rise | 4 m; 3 m |
| Hypotenuse | 5 m |
| Angle B; angle C | 36.870°; 53.130° |
| Slope | 75 % |
Hypotenuse = √(base² + rise²). B = atan(rise/base); C = 90° − B. Slope = 100 × rise/base. The three sides form the familiar 3–4–5 relationship.
Use metric or imperial lengths consistently and keep extra precision until the final display. Rounded diagram labels are not a measuring tolerance.
This is not a general triangle solver. Non-right triangles, bevel allowances, connection details and material thickness are outside the calculation.
Why can’t two angles give a length?
They set shape but not scale. Many differently sized triangles share the same angles.
Are percent and degrees interchangeable?
No. Percent is 100 times rise/run; degrees come from its arctangent.
- Why can’t two angles give a length?
- They set shape but not scale. Many differently sized triangles share the same angles.
- Are percent and degrees interchangeable?
- No. Percent is 100 times rise/run; degrees come from its arctangent.
Measurements, units and material terms
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