Triangle

Calculate the area of ​​the triangle ABC if b = c = 17 cm, R = 19 cm (R is the circumradius).

Correct result:

S =  115.63 cm2

Solution:

cos⁡α2=c/2r α=2arccos⁡c/2r=126∘51′ β=γ=180∘−α2=27∘  S=2r2sin⁡αsin⁡βsin⁡γ=115.63 cm2

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