Angle Calculator
Math CalculatorsCalculate angles between lines or within triangles.
0°
Degrees
0
Radians
About This Tool
Find the unknown angle of a triangle or the angle between two lines using coordinates or side lengths. Supports Degree and Radian modes.
Frequently Asked Questions
In a right triangle, you can use inverse trig functions. For example, $\theta = \arctan(\text{opposite}/\text{adjacent})$.
The sum of all internal angles in any Euclidean triangle is always exactly 180 degrees or $\pi$ radians.
Complementary angles are two angles that add up to 90 degrees. In a right triangle, the two non-right angles are always complementary.
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