1) Area of Triangles. ● Area of triangle using Heron's formula. ● Formula Derivation DERIVATION OF HERON’S FORMULA : Let  We have a ∆ABC whose sides AB, BC CA are a, b & c in length respectively. Construct  𝐴𝑃 ⊥ 𝐵𝐶 and mark it h. If BP = d  Then…