Obtuse Triangle Calculator

Your details

The side of the triangle opposite angle A.
m
The side of the triangle opposite angle B.
m
The side of the triangle opposite angle C.
m
Angle A in degrees (opposite side a). Must be between 0 and 180.
deg
Angle B in degrees (opposite side b). Must be between 0 and 180.
deg
Angle C in degrees (opposite side c). Must be between 0 and 180.
deg
Triangle typeObtuse triangle
Obtuse triangle

Whether the triangle is obtuse, right, or acute

Side a7m
Side b5m
Side c4m
Angle A101.537deg
Angle B44.4153deg
Angle C34.0477deg
Area9.798m²
Perimeter16m
Altitude to side a (ha)2.7994m
Altitude to side b (hb)3.9192m
Altitude to side c (hc)4.899m
Median ma (to side a)2.8723m
Median mb (to side b)5.1235m
Median mc (to side c)5.7446m
Inradius (r)1.2247m
Circumradius (R)3.5722m

This is an obtuse triangle.

  • The largest angle is 101.54 degrees, which determines the triangle type.
  • Side a (7.0000 m) is the longest side, opposite the obtuse angle - a defining property of obtuse triangles.
  • In an obtuse triangle, the circumcenter lies outside the triangle, and the orthocenter also falls outside.
  • Area: 9.7980 m², Perimeter: 16.0000 m.

Next stepNote: for an obtuse triangle, the foot of the altitude from each acute vertex falls outside the base, so the height lines extend beyond the triangle.

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