# Triangle calculator SAS

Please enter two sides of the triangle and the included angle
°

### Right isosceles triangle.

Sides: a = 100   b = 100   c = 141.4211356237

Area: T = 5000
Perimeter: p = 341.4211356237
Semiperimeter: s = 170.7110678119

Angle ∠ A = α = 45° = 0.78553981634 rad
Angle ∠ B = β = 45° = 0.78553981634 rad
Angle ∠ C = γ = 90° = 1.57107963268 rad

Height: ha = 100
Height: hb = 100
Height: hc = 70.71106781187

Median: ma = 111.8033398875
Median: mb = 111.8033398875
Median: mc = 70.71106781187

Inradius: r = 29.28993218813
Circumradius: R = 70.71106781187

Vertex coordinates: A[141.4211356237; 0] B[0; 0] C[70.71106781187; 70.71106781187]
Centroid: CG[70.71106781187; 23.57702260396]
Coordinates of the circumscribed circle: U[70.71106781187; 0]
Coordinates of the inscribed circle: I[70.71106781187; 29.28993218813]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135° = 0.78553981634 rad
∠ B' = β' = 135° = 0.78553981634 rad
∠ C' = γ' = 90° = 1.57107963268 rad

# How did we calculate this triangle?

### 1. Calculation of the third side c of the triangle using a Law of Cosines Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. ### 2. The triangle circumference is the sum of the lengths of its three sides ### 3. Semiperimeter of the triangle ### 4. The triangle area using Heron's formula ### 5. Calculate the heights of the triangle from its area. ### 6. Calculation of the inner angles of the triangle using a Law of Cosines    