# Properties of Triangles – Tangent Rule and Area of Triangle

Properties of Triangles – Tangent Rule and Area of Triangle Tangent rule (or) Napier’s analogy: In ΔABC, . . . Area of ΔABC is given by: (I) Δ = ½ ab sin C; Δ = ½ bc sin A; Δ = ½ ca sin B, (II) , (III) , (IV) Δ = 2R² sin A sin B Read more about Properties of Triangles – Tangent Rule and Area of Triangle[…]