Triangle Solver: Area, Perimeter, Sides & Angles

parallelogram with sides a, b, diagonals, height h and angles A, B

Distance: \[ d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \] Area (Determinant): \[ \text{Area} = \dfrac{1}{2} \left| x_a(y_b - y_c) + x_b(y_c - y_a) + x_c(y_a - y_b) \right| \] Angle (Law of Cosines): \[ \cos C = \dfrac{a^2 + b^2 - c^2}{2ab} \]

Triangle from vertices

Enter coordinates (x, y) of points A, B, C

Point A

xₐ

yₐ

Point B

x_b

y_b

Point C

x_c

y_c

Area 0 sq units

Perimeter 0 units

Side lengths & Angles

Side	Angle	Value
AB	∠A (at A)	0°
BC	∠B (at B)	0°
CA	∠C (at C)	0°

Step‑by‑step solution

Click calculate to see steps.

More references

Online Geometry Calculators and Solvers.