Analyze properties of an obtuse triangle (one angle > 90°).
Triangle Properties
Triangle Data
Is Obtuse?Yes
Side c9.28
Area17.23
Perimeter21.28
About this calculator
What is an Obtuse Triangle?
An obtuse triangle is a triangle in which one of the interior angles measures more than 90 degrees. The side opposite the obtuse angle is the longest side of the triangle.
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Pro Tips
Only one angle can be obtuse.
The sum of angles is always 180°.
Obtuse triangles are a type of oblique triangle.
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Fun Facts
"The orthocenter of an obtuse triangle lies outside the triangle."
"The circumcenter of an obtuse triangle also lies outside the triangle."
