Classifying Triangles Calculator
MathClassify a triangle by its side lengths and angles from its three side lengths.
Classification
The triangle classified by both its side lengths and its angles.
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Odeh Ahwal0people find this calculator helpful
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Frequently Asked Questions
How is a triangle classified by its sides?
Equilateral means all three sides are equal, isosceles means exactly two sides are equal, and scalene means all three sides are different lengths.
How is a triangle classified by its angles without measuring angles directly?
Sorting the three sides from shortest to longest and comparing the sum of the two shorter sides squared against the longest side squared tells you the angle type: if the sum is greater, the triangle is acute; if equal, it is a right triangle; if less, it is obtuse. This comes directly from the law of cosines.
Can a triangle be both equilateral and right-angled?
No. An equilateral triangle always has three 60 degree angles, which makes it always acute, never right or obtuse.
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