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Triangle Calculator

Calculate the area of a triangle, side lengths, angles, perimeter, and more.

Press to see the model. Try your own inputs or the examples below. Refresh your browser to clear results.

3 Sides (SSS): a = 3 b = 4 c = 5

2 Sides + Angle (SSA, SAS): a = 1 b = 1 g = 60

2 Angles + Area (AA*): «ctrl+g» a = 30 «ctrl+g» b.«ctrl+s»c = 1 A = 1

2 Sides + Area + Obtuse/Acute: a = 3 b = 3 A = 1 gIsObtuse = true  

To see how an area was calculated, for example, type how A .