Calculator programs · Measures, Shape and Space
Triangle from three points
From three vertices: the area, the in-centre and in-radius, the circumcentre, the orthocentre and the circumradius.
Measures, Shape and Space
When it helps
Centres of a triangle are a long hand calculation (two perpendicular bisectors, or two altitudes, then solving). The circumcentre appears in 7 of the last 14 years and the in-centre in 6; the area and orthocentre come free.
At each prompt
- x₁, y₁, x₂, y₂, x₃, y₃
- Size
- 246 bytes
- Keying in
- about 9–15 min to key in (370 presses)
- Run mode
- COMP
- Memories it overwrites
- A, B, C, D, X, Y, M
- Where it goes