theorems-about-triangles

Articles

• Napoleon's theoremOn lines connecting the centres of equilateral triangles built on the sides of a triangle
• Exterior angle theoremExterior angle of a triangle is greater than either of the remote interior angles
• Morley's trisector theorem3 intersections of any triangle's adjacent angle trisectors form an equilateral triangle
• Napoleon's theoremOn lines connecting the centres of equilateral triangles built on the sides of a triangle