Classifying Triangles Calculator

Your details

Length of the first side of the triangle.
cm
Length of the second side of the triangle.
cm
Length of the third side of the triangle.
cm
Triangle typeEquilateral
Equilateral

Classification by sides and by angles combined

Angle typeAcute
Side typeEquilateral
Angle A60deg
Angle B60deg
Angle C60deg
Perimeter15
Area10.8253
Inradius1.4434
Circumradius2.8868
Altitude to a4.3301
Altitude to b4.3301
Altitude to c4.3301
Valid triangleYes

This is an Equilateral triangle.

  • All three sides are equal and all interior angles are exactly 60 degrees.
  • An equilateral triangle is also always acute and equiangular.
  • All angles are less than 90 degrees, so this is an acute triangle.
  • Perimeter: 15.00 cm. Area: 10.8253 cm².

Next stepUse the Law of Cosines to find any missing side or angle.

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