12 13 18 triangle

Obtuse scalene triangle.

Sides: a = 12   b = 13   c = 18

Area: T = 77.95215073619
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 41.77884625885° = 41°46'42″ = 0.72991717286 rad
Angle ∠ B = β = 46.20110751782° = 46°12'4″ = 0.80663608798 rad
Angle ∠ C = γ = 92.02204622333° = 92°1'14″ = 1.60660600452 rad

Height: ha = 12.99219178937
Height: hb = 11.99325395941
Height: hc = 8.66112785958

Median: ma = 14.50986181285
Median: mb = 13.84773824241
Median: mc = 8.68990735985

Inradius: r = 3.62656515052
Circumradius: R = 9.00655987852

Vertex coordinates: A[18; 0] B[0; 0] C[8.30655555556; 8.66112785958]
Centroid: CG[8.76985185185; 2.88770928653]
Coordinates of the circumscribed circle: U[9; -0.31875050854]
Coordinates of the inscribed circle: I[8.5; 3.62656515052]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 138.2221537411° = 138°13'18″ = 0.72991717286 rad
∠ B' = β' = 133.7998924822° = 133°47'56″ = 0.80663608798 rad
∠ C' = γ' = 87.98795377667° = 87°58'46″ = 1.60660600452 rad

Calculate another triangle




How did we calculate this triangle?

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.


Fatal error: Uncaught Error: Class 'TexPNG' not found in /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/Calculator_Triangle.php:2346 Stack trace: #0 /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/Calculator_Triangle.php(1929): Calculator_Triangle->ComputeTriangle(12, 13, 18, '<br />', true, '', Array, '<a href='/?what...', Array) #1 /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/Calculators.php(1086): Calculator_Triangle->TriangleForm('Triangle calcul...') #2 /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/Calculators.php(2225): Calculators->Router('triangle', 'Triangle calcul...', 'Geometry') #3 /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/index_real.php(490): Calculators->Run() #4 /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/index_real.php(771): HackMath->Run() #5 /nfsmnt/hos in /nfsmnt/hosting1_1/1/f/1f5dde43-2431-429d-b7d6-b283e5dc0656/triangle-calculator.com/web/Calculator_Triangle.php on line 2346