
1. An object having length width and height is called solid. The side portion of a solid are called lateral surfaces. A solid is a three dimensional object.
2. A prism is polyhedron with two identical ends such that the lines joining the corresponding verticies of the two ends are all parallel. 3. Right Prism: A prism whose bases are perpendicular to the lateral edges and all lateral faces are rectangles is called right prism. 4. A prism is named according to the shape of its base. If the base of a prism is a triangle, then the prism is called triangular prism. 5. Number of lateral surfaces of a right prism = Number sides of the base of the prism. 6. Total number of surfaces of a prism = Number of lateral surfaces + 2. 7. Number of edges of a prism = 3 * Number of sides. 8. Sum of the lengths of edges = Number of sides * height + twice the perimeter of the base. That is S = n*h + 2s. 9. Lateral surface of a prism = Perimeter of the base * height. That is, A = p * h.
10. If 'a' is the side of cube.
11. If l is the length, w is the width and h is height of a cuboid.
12. In triangular prism. 14. The area of a equilateral triangle = (Ö3/4)a^{2}. Where a is the side of the triangle. 15. The area of a right angled triangle = 1/2 * ab, Where a, b are the sides containing right angle. 16. The area of a right angled isosceles triangle = 1/2*a^{2}.
17. The area of rhombus = 1/2 * d_{1} * d_{2}. Where d_{1}, d 18. Volume of cuboid = l * b * h cubic units. 19. Sum of the edges of a cuboid = 4(l + b + h) units. 20. Diagonal of a cuboid = Ö(l^{2} + b^{2} + h^{2}).
21. Volume of the cube = a^{3} cubic units.
