Question

The surface area of a cube is equal to sum of the surface area of three other cubes whose edges are 3cm, 4cm, 12 cm respectively. Find the edge of first cube

Answer 1

surface area of the cube = 6×12×12+6×4×4+6×3×3
=864+96+54
=1014
there fore it's edge is square root of 1014÷6
Square root of 169
=13

Answer 2

Answer:

Step-by-step explanation:

sum of surface area of cube =

                                                 = 6×3×3×4×4×6×12×12

                                                  =6×169

                                                  = 1014 cm sqaure