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Calculation of area of a triangle, when the radius of the circumscribed circle and the length of the three sides are known

ÀÛ¼ºÀÚ Uploader : ppippi ÀÛ¼ºÀÏ Upload Date: 2019-08-10º¯°æÀÏ Update Date: 2019-08-13Á¶È¸¼ö View : 252

When the angles of the triangle ABC are called A, B, and C, respectively, and the radius of the circle circumscribed by the triangle ABC is R, the area S of the triangle is as follows.

S = 2*R^2*sin(A)*sin(B)*sin(C)

If the lengths of the sides facing each of A, B, and C are a, b, and c, we get the following by the sine law.

sin(A) = a/(2*R)

Since S = (1/2)*b*c*sin(A),

S = a*b*c / (4*R)

*** Âü°í¹®Çå[References] ***

S = a*b*c / (4*R)
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