Similar Triangles Calculator

Your details

Length of side a of the first triangle.
Length of side b of the first triangle.
Length of side c of the first triangle.
Length of side a of the second triangle (corresponding to side a of Triangle 1).
Length of side b of the second triangle (corresponding to side b of Triangle 1).
Length of side c of the second triangle (corresponding to side c of Triangle 1). Leave blank (0) in Find Missing Side mode to solve for it.
Scale factor (k)Similar
2

Triangle 2 side / Triangle 1 side. Greater than 1 means Triangle 2 is larger.

Are they similar?Yes - the triangles are similar
Similarity criterionSSS - all side ratios equal (a: 2.0000, b: 2.0000, c: 2.0000)
Ratio a1/a22
Ratio b1/b22
Ratio c1/c22
Perimeter - Triangle 112
Perimeter - Triangle 224
Perimeter ratio (T2/T1)2
Area - Triangle 16
Area - Triangle 224
Area ratio (T2/T1)4

These triangles are similar.

  • The scale factor k = 2.0000 means Triangle 2 is larger Triangle 1.
  • Area of Triangle 2 is 4.0000 times the area of Triangle 1 (k^2 = 4.0000).
  • The perimeter ratio (2.0000) equals k, confirming all sides scaled uniformly.

Next stepSimilar triangles have identical angles. Use the scale factor to convert any measurement from one triangle to the other.

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