Law of Cosines
c² = a² + b² - 2ab·cos(C)
Side Lengths
a =
0
b =
0
c =
0
Angles
∠A =
0°
∠B =
0°
∠C =
0°
Triangle Type:
Acute
Verification
Derivation from Pythagorean Theorem
Step {current} of {total}
Example Triangles
Acute Triangle
All angles < 90°
Right Triangle
One angle = 90°
Obtuse Triangle
One angle > 90°
SAS Case
Given two sides and included angle
SSS Case
Given three sides