A cube whose edge is 20 cm long has a circle of largest diameter on each of its faces painted black. what is the total are of the unpainted surface of the cube
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Area of one face of cube_20²=400cm²
Diameter_20cm then radius_10cm
area of one circle on one face on cube_πr²
area_3.14×10×10
_314cm²
Total faces of cube_6
then total area_6×400=2400--------------------(1)
Total number of circles_6
then total area of circles_6×314=1884--------(2)
unpainted area_(1)-(2)
_2400-1884=516cm
So total area of unpainted part is 516cm²..
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Diameter_20cm then radius_10cm
area of one circle on one face on cube_πr²
area_3.14×10×10
_314cm²
Total faces of cube_6
then total area_6×400=2400--------------------(1)
Total number of circles_6
then total area of circles_6×314=1884--------(2)
unpainted area_(1)-(2)
_2400-1884=516cm
So total area of unpainted part is 516cm²..
Comment for queries.....
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area of cube side square 20 into 400 CM square then area of circle Pi R Square is equal to 22 upon 7 into 10 into 10 the diameter of circle is 24 the radius is 10 the area of a circle is 340 cm and area of cube is 400 CM square the number of the number of cubes is total 6 so the area of two surfaces of cubes 6 into 400 is equal to 2400 the number of circles is 6 so the total surface area of circle is 1883 so tract the area of cube minus area of circle answer is 516 CM square
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