Question

the perimeter of one face of a cube is 20 cm.Calcutae Its total surface area

Answer 1

we know that a face of cube is of square shape
now perimeter of the square is given = 20cm
so , 4×side =20
= side =20÷4=5cm
now total surface area of cube = 6 side square

= 6×5×5=150 cm square

Answer 2

hello friend
the perimeter of square = 4× sides
20 = 4×side
side= 5
As we know that cube is made up of six same square then
TSA of cube = 6a^2
TSA= 6(5)^2
TSA= 6×25
TSA= 150 cm^2



thanks dear.