Explore the triangle area formula, its derivation, and practical examples to master this essential geometric concept effortlessly.

The perimeter and area of triangles, quadrilaterals (rectangle, parallelogram, rhombus, kite and square), circles, arcs, sectors and composite shapes can all be calculated using relevant formulae.

Learn how to calculate the areas of rectangle, triangle, and circle in Excel for a single cell or range of cells usin this formula.

Revise how to calculate the area of a triangle. Learn how to calculate the triangle's area by first finding the area of a rectangle in this BBC Bitesize maths guide.

JEAN E. KILMER, Triangles of Equal Area and Perimeter and Inscribed Circles, The Mathematics Teacher, Vol. 81, No. 1 (JANUARY 1988), pp. 65-70 ...