7. The surface area of a cube is equal to the sum of the surface areas of three other cubes
whose edges are 3 cm, 4 cm and 12 cm respectively. Find the edge of the first cube.
Answers
Answered by
7
Area of cube with edge 3cm = 6×3×3 = 54
Area of cube with edge 4cm = 6×4×4 = 96
Area of cube with edge 12cm = 6×12×12 = 864
Surface area of the bigger cube = 54+96+864 = 1014
Now according to question, 6a² = 1014
a² = 1014/6 = 169
a = √169 = 13cm
Step-by-step explanation:
Hit the mark as Brainliest button below
Similar questions