Question

18. A cube whose edge is 20 cm long has a circle of diameter 20 cm each of its face painted red
What is the area of unpainted surface of the cube​

Answer 1

Answer:

area of each face of a cube 20×20 = 400cm²

are of circle of diameter 20 cm r = 10 => 3.14×10×10 = 314cm²

area of unpainted surface of each face = 400cm²-314cm² = 86 cm²

unpainted surface of cube=> area of 6 face = 86×6 = 516