4 thoughts on “Triangles – Area Formulae

  1. Sir but area of the triangle is 1/2 bc*sin a, if we draw the triangle we come to know that sin a = a/2r… so substituting we get abc / 4r

    • Girish, you’re right, that’s a fair bit simpler than the method I used (proved it painfully from scratch – I learnt this formula before the 1/2 * absinC formula!). However, your method too requires the inscribed angle theorem and similar triangles to prove that sinA = a/2R 🙂 So I still stand by at least part of what I said 😉


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