Basic Geometry: What are Geometry Formulas? Geometry formulas are employed to calculate dimensions, perimeter, area, surface area, volume, and other attributes of both 2D and 3D geometric shapes. 2D shapes encompass flat figures such as squares, circles, and triangles. On the other hand, examples of 3D shapes include cubes, cuboids, spheres, cylinders, and cones. The fundamental geometry formulas are outlined below: Formulas for 2D Geometry: 1. Perimeter of a Square = 4 × Side 2. Perimeter of a Rectangle = 2 × (Length + Breadth) 3. Area of a Square = Side² 4. Area of a Rectangle = Length × Breadth 5. Area of a Triangle = ½ × Base × Height 6. Area of a Trapezoid/ Trapezium= ½ × (Base₁ + Base₂) × Height Area, A = ½(a + b)h Where, a and b are the parallel sides h = distance between two parallel sides 7. Area of a Circle = A = π × r² 8. Circumference of a Circle = 2πr 9. Area of a rhombus A= 1/2 d1× d2 10. Area of a kite A= 1/2 d1 × d2 11. Area of equilateral triangle= √3/4 a s...